When comparing Dvorak Simplified Keyboard vs Programmer Dvorak, the Slant community recommends Programmer Dvorak for most people. In the question“What are the best keyboard layouts for programming?” Programmer Dvorak is ranked 2nd while Dvorak Simplified Keyboard is ranked 6th. The most important reason people chose Programmer Dvorak is:
J and K are where C and V are on QWERTY. H is still left of L.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro More ergonomic
Designed with comfort in mind.
Pro Standard on all operating systems
You can find this layout on all operating systems.
Pro Opportunity to learn proper touch typing
Most people passively learn and use QWERTY-based layouts before switching to Dvorak. The switch gives them an opportunity to completely relearn 10-finger typing, which is where a significant portion of the speedup comes from. Coupled with more ergonomic key placement, this makes for a more enjoyable typing experience.
Pro Useful keys in home row
70% of more useful keys are placed in the home row.
Pro You can reuse qwerty layout
Since letters and symbols only change place, but not key, you can change the keys on your keyboard and get a full comfortable Dvorak layout, without having to buy a new keyboard.
Pro Vowels all on one hand making it easy to teach to kids
Pro Vim keybindings still make sense
J and K are where C and V are on QWERTY. H is still left of L.
Pro Made for programming
This keyboard took a stand and optimized the Dvorak standard for programming.
Pro Easy to learn if you're already used to Dvorak
The letter keys are the same, so it's not nearly the same mental jump as Qwerty to Dvorak.
Pro Keyboards are designed for human comfort
Pro Programmer punctuation without shifting on the top row
The top row is hardest to reach, and shifting doesn't make this easier. Programmers uses punctuation far more than numerals, so it makes sense to shift for the numerals instead of the punctuation.
Pro Preinstalled on Linux
You can enable it systemwide when you're installing Ubuntu.
Pro Open source
The keyboard layout is open source and available for edition.
Pro Typing feels more comfortable
Completely subjective of course.
Pro Easily switch between Standard Dvorak and Programmer's one
Dvorak Simplified Layout is more general and available on all OS, if we need to type on other's computer, we can still use the Dvorak Simplified Layout for typing.
Pro Better number arrangement
The smallest numerals are the most frequently used, so why should they be on the weak fingers of the left hand? The order still makes sense too. Odd numbers on the left, even numbers on the right, ascending from the inside out (with the least used numeral '9' in the middle).
Pro Don't need to buy another keyboard or move keycaps around
Having the original QWERTY labels is useful for other people using your computer or if you ever need QWERTY. Not having keycaps labeled in Dvorak forces you to learn to touch type. All QWERTY keyboards can be remapped to Dvorak in your operating system settings, so you don't need a physical Dvorak keyboards.
Pro Number arrangement is the same as the original Dvorak keyboards
Pro More use means more usage
If an individual uses this and tells other people or they try it, the layout will be more popular, and those people will tell people and the world will change.
Pro Other people can't use your computer unless you switch it to QWERTY for them
Cons

Con Inconvenient for common key-shortcuts
Key bindings common to most applications, such as Ctrl+Z/C/V, can't be done on the left hand while mousing with the right. Shortcuts for other applications are out of the QWERTY positions they were designed for and aren't so convenient to access.
Con The U is directly under your finger while the I is far away
I
is used more--by about 2.5 times. In fact, U
is the least used vowel after Y
. The consonants TNSHRDLC
all appear more often. So why is U
directly under your finger? And why should you have to stretch for I
?
Con F is too hard to reach
F
is not an especially common letter, but it's used much more than the rare letters JQZ
. Why is it on one of the most difficult spots on the keyboard? It's also used in OF
, one of the more common bigrams, ranked at #13. Maybe some other languages use Z
more than English, but why is F
harder to reach than Q
?
Con L is too hard to reach
L
is not a rare letter. It's used even more than U
is in English. Why put it in a difficult spot for use with the weak pinky finger?
Con Not the standard keyboard layout
It will be difficult to frequently switch between computers.

Con The "ls" command is uncomfortable to type
This is a very common command programmers have to type often when working with the shell. It's pretty awkward in Dvorak, especially when you add common options. Try typing "ls ‐latr", and see how that feels.
Con Difficult for occasional moments when you have only one hand free
Hand-alternation is good for touch-typing with both hands, but problematic (a lot of horizontal movement) when typing with one. Can be avoided by temporarily switching to another layout.
Con Not easy on the right pinky finger
Most useful symbols for programming are on the right pinky finger, which is not very comfortable.
Con Doesn't account for finger length
The keyboard layout doesn't account for E being easier to press than C for example on a QWERTY layout, this can be seen for example using the workman key cap scores done here.
Con Not actually faster than QWERTY
Maybe it's more ergonomic, but that's debatable. You'll certainly get more benefit from an ergonomic keyboard than a change in layout. Dvorak's reputation for speed is due to a typo in the initial press report, and a biased (and since discredited) study run by Dvorak himself. Dvorak is all hype and no substance.
Con Other people can't use your computer unless you switch it to QWERTY for them
Con Keyboard controls for video games and other applications are all made for QWERTY
If you want to game, the WASD keys are completely unusable. You either need to switch to QWERTY (and then switch to Dvorak every time you want to use in game chat) or spend time remaping every key, because games don't come with Dvorak keymaps. Sufficiently popular games might have Dvorak mods.
Con It takes a couple weeks before you're back to a usable speed when switching from QWERTY
Achieving your old QWERTY speed can take a month or more.
Con Dvorak users usually still use QWERTY on their smartphones
Dvorak is made for ten fingers. Its main ideas, such as maximizing the number of "finger rolls" and alternating hands, don't make much sense when you're typing with your thumbs.
Con SHORTCUTS nightmare
Shortcuts, Shortcuts, Shortcuts, it is a total nightmare for users even used it for years.
Con Typing numbers is hard
Numbers are arranged for their characters, not in ascending order. You also have to shift.
Con It probably won't make you type much faster, if at all
Con Punctuation moved, not just letters
Punctuation moved in addition to letters, meaning that the learning curve is that much harder coming from QWERTY because nearly every key is in a different place.
