When comparing Roccat Lua vs Logitech G303, the Slant community recommends Logitech G303 for most people. In the question“What is the best gaming mouse?” Logitech G303 is ranked 14th while Roccat Lua is ranked 38th. The most important reason people chose Logitech G303 is:
The G303, along with the Logitech G502 and G900 and the Corsair M65 PRO RGB, has the single best sensor on the market, the Pixart PMW3366. This sensor has no acceleration or angle snapping that can't be disabled and has a native DPI of 12,000.
Specs
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Pros
Pro Comfortable to use
Its rather small size and lower than usual height allow for a substantially comfortable grip. The sides have a dent which helps fingers positioning. Additionally, the sides are smoothly textured so you shouldn’t ever feel like your hand is losing its grip.
Pro Well suited for fingertip and claw grips
Unless you have small hands, this is a mouse that is meant for people who use either the claw or fingertip grip. In addition to being a small mouse and having low height, it's also extremely light, weighing only 68 grams. This makes it easy to control with a fingertip and claw grip as it relies on the mouse being as agile as it can be.
Pro Well built
Even though it’s a budget mouse, it has high quality components to ensure that the mouse can last for years. There are no unnecessary moving parts while button clicks are clear and don’t give out after heavy use. The body of the mouse consists of rubberized coating at the top and textured plastic on the sides which gives it a quality feel.
Pro Good amount of customization provided by the accompanying software
The software is very simple and easy to use. It lets you change the DPI steps, double click speed, vertical scroll speed, polling rate, very basic lighting control and the choice of hand-mode. In addition, it has the option to reassign its buttons, but since the Lua has only four buttons it’s practically useless as the main three are almost always invariable.
Pro Excellent budget sensor
The Avago A3050 optical sensor that the Lua uses has small, unnoticeable prediction and doesn’t carry over perfect tracking at high speeds (depending on the chosen DPI setting, over 60-120 inches per second or 1.5 m/s-3 m/s). But unless you use it at extremely low sensitivity, it shouldn’t be a problem. When reaching such speeds, some negative acceleration may be noticed.
Pro Full Linux support
Roccat has good Linux drivers.
Pro Can be used by both righties and lefties
Uses an ambidextrous design that actually feels as if it is and ergonomic design no matter what hand is using it.
Pro On-the-fly CPI switch
There is a button right behind the scroll wheel that will allow for on-the-fly CPI switching.

Pro Excellent sensor
The G303, along with the Logitech G502 and G900 and the Corsair M65 PRO RGB, has the single best sensor on the market, the Pixart PMW3366. This sensor has no acceleration or angle snapping that can't be disabled and has a native DPI of 12,000.

Pro Compact size gaming mouse
People with small hands needn't look at mice like the Corsair M65 gaming mouse and despair. The G303 gaming mouse has a solution. It's about the size of the $5 USB mice that are often bundled with desktop computers, but it has most of the features of a full-size gaming mouse.
Pro Comfortable
Logitech G303 is very comfortable if you have medium to small hands, and if you are using your mouse with claw or fingertip grip.

Pro Accessible price
The G303 gaming mouse has an MSRP of $49.99, but it goes on sale rather frequently for as low as $24.99. Compared to high-end gaming mice like the Rival 700 and the G502, that's quite a steal.

Pro RGB lighting
It glows. You can change the colors. There isn't much more to say, except that it will fit in with basically any setup that uses black devices with colored lights.
Cons
Con Lacks sidebuttons
Since it’s in the style of a classic three-button mouse, the lack of side buttons limits customization options.
Con Small size takes some getting used to
The Roccat Lua is a small mouse, measuring only 11.5 cm in length and 3 cm in height. The width is pretty standard with 6.5 cm at the back and narrows down towards the front. The small size might raise some concern about the grip. If it’s your first mouse of this size you might need to adjust your grip to accommodate for the smaller scale of the mouse. Commonly the grips change and include some elements of a fingertip grip.
Con Top DPI value may feel insufficient for some gamers
The DPI amount caps at 2000, which might not be enough for some.
Con Can suffer from small amounts of jitter on high DPI values
This mouse's DPI setting can be set from 250 to 2000, in increments of 250. At DPI settings higher than 1250, it can generate small amounts of jitter. The mouse works the best at 500 DPI with a 1000Hz polling rate.
Con Rubber cord is prone to breaking
It has a rubber type cable which means there’s less resistance and drag against the desk but at the same time can be more prone to damage when bent.
Con Light weight takes some getting used to
At 68 grams, it's about 30% lighter than most mice. Switching from an average mouse might take some getting used to and feel like the Lua is a bit floatey.
Con Uses an outdated sensor
The Lua’s optical sensor might be a bit dated, since it was released five years ago. Still, it mostly only shows weakness when it is facing really fast mouse movements. And as long as you are aware of it, this shortcoming can be entirely avoided.
Con Low palmrest height
The low palmrest height may be a turn off for some palm style users.
Con Build quality not the best
Scrolling wheel sometimes makes cranking noises while you are scrolling through it. If you tighten the mouse from the sides, the cheap plastic will make a noise.
Con A minimum selection of buttons
The Logitech G303 only has one controllable button on the top, two buttons on the side and a programmable mousewheel. The mouse offers six different buttons if you include left- and right-click.
