When comparing Logitech G910 Orion Spark vs Filco Majestouch-2, the Slant community recommends Filco Majestouch-2 for most people. In the question“What are the best mechanical keyboards?” Filco Majestouch-2 is ranked 2nd while Logitech G910 Orion Spark is ranked 12th. The most important reason people chose Filco Majestouch-2 is:
Filco keyboards are renowned for their fantastic build quality. The keyboard weighs nearly 3 pounds and is built like a tank with virtually no flex in the backplate.
Specs
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Pros

Pro RGB backlighting
Like the Blackwidow Chroma and K95/70/65 RGB keyboards, the G910 supports custom per-key RGB colors.

Pro Almost no LED bleeding
Because the Romer-G switches actually have LEDs inside them, which is impossible with switches like Cherry MX, Kailh or Topre, it's very difficult for any of the light to bleed out. It still happens a bit, but not much.

Pro Windows key locking
Most keyboards support this in one form or another, but the G910 has a nice big button next to the lock LEDs.

Pro Lots of macro keys
G1-G5 are easy to reach, G6-G9 less so. There are also M1, M2, and M3 profiles, which can hold a complete set of G-keys each. LGS can also configure this per-game, so players of multiple MMOs can have three sets of G-keys for each MMO rather than just three in total.

Pro Logitech Gaming Software
The G-keys and lighting have tons of configuration options in LGS. This is also a pro for users of Logitech G-Series mice and headsets, as you only need one software installation to work with all of them.

Pro Arx Dock
Instead of the LCD screen that Logitech put into several previous keyboards, the G910 has a phone dock and iOS/Android app. This has several advantages over the embedded screen, mostly lower cost and the ability to control the screen on its own. Arx Control can monitor system temperatures and clocks and even launch games.

Pro Media keys
Like most large gaming keyboards and unlike smaller, general-purpose keyboards (Ducky, Leopold, Topre, etc.), the G910 has a full set of media keys (play/pause, stop, rewind, fast-forward, mute, and a volume roller).

Pro LUA scripting
LGS has a LUA scripting engine in case its macro capabilities aren't enough. Unfortunately, scripts are wholly separate from macros, so you can't save scripts and then use the GUI to assign them to keys.
Pro Great build quality
Filco keyboards are renowned for their fantastic build quality. The keyboard weighs nearly 3 pounds and is built like a tank with virtually no flex in the backplate.
Pro Compact and simple design
The overall aesthetics of this keyboard are very clean and simple. The finish is not prone to fingerprints and the printing of the key labels on the side of the keycaps (on the ninja version) makes the keyboard look minimalistic while still being easy to see which keys are where.
Pro Uses Costar stabilizers
Filcos use Costar stabilizers, which are generally preferable for people who prefer a "snappy" feel to their keyboards.
Pro Key labels don't fade out
The ninja version has the key labels printed on the front of the keys to avoid them fading out over time.
Pro Highly moddable
There are a lot of mods available for this keyboard, including rounded keycaps or colored cases.
Cons

Con Feet are rather short
The G910 is almost completely horizontal with the feet out, and it actually angles backward with them retracted. Longer legs would help a lot.

Con No custom keycaps
There are no custom keycaps for Romer-G switches. Also, since they have completely different stems from all other existing switches, keycaps made for other switches also can't be used.

Con Lighting modes are restrictive
Each key can be set individually, but if you want to create an animation, then it has to be across the whole keyboard. It's no possible, for example, to animate just the number pad.

Con Wrist rest cannot be removed
The G910 has a wrist rest skeleton built onto it. It comes with two covers, one covers the skeleton and the other one extends it, but it cannot be removed.

Con Keycap font
The keycap font is one of those that can be referred to as a stereotypical "edgy gamer" font. Something more discreet, like Arial, would be much better.

Con Takes up much space
The G910 is very large, even for a fullsize keyboard.

Con Long key travel distance
The G910's Romer-G switches have a longer travel distance than most domes.
Con Not backlit
The Filco does not come with key backlighting. This makes it harder to use in the dark (especially when hunting for special characters) and also isn't as flashy as RGB models.
Con ABS keycaps aren't as durable as other materials
Some alternative keyboards have keycaps made from PBT (polybutylene terephthalate) which are more durable, have a nicer texture and generally are of better quality. Many Filco keyboard users switch out the default ABS (acrylonitrile butadiene styrene) keycaps for PBT caps, but this is going to cost you an extra ~$60.

Con Has no number pad
Some users require a number pad as it makes number crunching in spreadsheets much quicker, easier, as well as more accurate.

Con No calculator button
Unlike some other keyboards, the Majestouch-2 doesn't have a calculator shortcut button.
