Topre Realforce 104UB vs Logitech G910 Orion Spark

Topre switches are a mix between mechanical switches and rubber dome switches. They have mechanical components, however they are covered beneath a rubber dome which protects the switch. They bring a mechanical feel, and mix it with the durability of a rubber dome switch.

Variable weights under each specific groups of keys was done in a bid to prevent RSI (repetitive strain injury). For instance, the groups of keys that the pinky finger hits are much lighter/softer than the rest of the groups of keys that are pressed by the rest of the fingers. Variable weights are achieved by having either heavier or lighter rubber domes. Whilst this idea is very useful for normal typing, for gaming it's not so great: for instance, when dealing with First Person Shooter games that requires WASD keys, those sets of keys feel very light when fingers other than the pinky are used to actuate them.

Silenced Topre switches are designed for those who do not particularly like the sound of keyboards being tapped on or for those who may be concern over disturbing others when using a noisy keyboard. Silencing is done mainly by placing a material that absorbs the sound of the slider when it makes contact with the slider housing. This thereby prevents excessive noise when the key has been released after it has been actuated. The overall effect of a silenced Topre is quite astounding as it may give the impression one is on a cheap keyboard (obviously, the reality is actually the opposite).

PBT (polybutylene terephthalate) keycaps last longer than other keycap materials, and are more durable. They are more expensive than ABS (acrylonitrile butadiene styrene), which is why they are less commonly found.

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

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.

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

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.

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.

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.

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).

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.