That's default RMA and the translation.
I haven't messed with any of the other versions, ShadowRMA seemed to be fairly popular as most RMA videos I found were using that, heres the list of its features (Just done through google translate)
• Restored the "Kiss of the bloodsucker," Psi-kick pseudodog, and the ability byurer knock weapons out of the hands and lower endurance.
• Restored bildovsky version of the Controller, as a new species living only in certain places in the zone.
• Poltergeist now after a long flying materialized and descended to earth to regain strength before the next flight.
• Restored bildovsky inventory with all the features including the use of slots knife, binoculars and a flashlight, a full bed with the possibility of using time and ammunition from his belt.
• Restored the ability to install and remove the markers on the map in the PDA.
• Added desktop computers and to use it.
• Returned to the shaders, and some graphic effects from build 2218.
• Restored bludmarki and collision of bodies.
• Added a Freeplay mode after passing through the main story.
• Restored the weather of the builds.
• Restored bildovskoe of the game and interface.
• The new-old transitions between locations.
• New unused locations populated mutants.
• Replaced some texture and vegetation on bildovskie counterparts.
• Restored builds some of the visuals of the protagonist, NPC and monsters.
• restored some of the functions of light sources in the game.
• Restored bildovskaya diagram of a helicopter crash.
• Restored carved transport model. Also rebalance the entire transport.
• Added periodic bursts of psi-emission at Yantar.
• Restored carved weapon models and animations. Also recovered weapons P-90, BM-16 and PCM.
• Restored to dizdokam story intro videos.
• Restored some properties of the anomalies - such as the transfer of momentum to the objects of "Trampoline" and damage from "rusty hair."
• Expanded AI stalkers - they are actively using grenades, and can treat their comrades.
• Recovered in shelter care NPC for badly wounded.
• Restored some post-effects.
• Restored death reports of stalkers, as well as messages about information updates to the device.
• Restored audio and visual effects in the laboratory X-10.
• Replaced a lot of sounds in the game at bildovskie, including voice changed some groups.
• Completely replaced by ambient music on the locations to more atmospheric tracks.
• Changed hiding weapons in areas of the traders. If the dealer you trust, you let it, even with arms in their hands.
• Some characters adds the ability to repair weapons and ammunition.
• Restored carved articles about locations in the CCP.
• Changed the description of some locations, items, dialog, weapons, etc.
• In the options unlocked some video settings for dynamic lighting.
• Twice during the slow time in the game, as well as time to sit side quests has been increased to 7 days.
• Restored the possibility to hang skirts on some weapons.
- Fixed crash when using food and medicine from the corpses.
- Fixed bugs on the global map in the PDA. Fixed map locations The Dead City, generators and disaster.
- Fixed the dialogue at Yantar - now everything is logical. Just the Manage other dialogs.
- Fixed voice Monolith, now they do not poison jokes.
- Fixed killing the orderly bandits.
- Fixed visual frequent dumping of the protagonist.
- Fixed some bugs and shortcomings of the original game.
• And much more ...