What are the gameplay differences between ETPro and Legacy mod? - ET-Legacy-Competitive/faq GitHub Wiki

Whilst Legacy mod aims to be as close to ETPro as possible, there are some essential differences in the gameplay between the two mods that you should bear in mind:

Leaning is visible for your opponent, especially if the player is too close to the corner.
There's a high chance that movers - like truck and tank - will gib the player if they run over them when in prone or wounded state, instead of simply pushing them. Same goes for closing doors. Generally, it is unsafe to lay in the truck (with gold in it) if it is moving up a hill or turning.
Physics are slightly different - players gain slightly more speed when jumping (you might need adjustment for some trickjumps) - the speed is lower than "pmove_fixed" 1, but higher than ETPro "b_fixedphysics".
Hitboxes and hit registration in general should be superior to ETPro - some long time bugs and issues that are still present in ETPro were fixed).
It is pretty much safe to play on sv_fps 40 instead of sv_fps 20 - the game is updated and updates are sent more frequently, which means - for instance - faster hitsound and lower ping (in big simplification, you can think about it the same way as about tickrate 64 vs 128 in CS:GO - in general, the game should feel better)
You can play on Legacy mod with 2.60b ("vanilla") client or ET: Legacy client. ET: Legacy client has a built-in minimizer and in general is a lot more modern and far more superior than 2.60b client.
Spawntime selector is no longer needed in Legacy mod. All you need to do is "bind YOURKEY resettimer". The correct time interval for given map will be selected automatically.
ET: Legacy client has got widescreen support - meaning ETPro fov is not equal to Legacy fov. The allowed fov range in Legacy is 75-160 (extended to 120 in competitive configs) which corresponds to 106.26-120 ETPro fov.
Visible explosions are forced - cg_wolfparticles CVAR was removed. However, the explosions has been reworked, no longer being an actual obstacle during game (can be compared to explosions in CS:GO or RTCW).
Proning collisions are slightly different.
Missile hitsounds are enabled - you will hear a hitsound when dealing damage with grenades, artillery, airstrike.
Reviving is slightly easier (higher hitbox).
Legacy doesn't support ETTV/gamestv.
The shoutcaster feature has been reworked, being now far more superior to ETPro shoutcaster. To test the reworked shoutcaster feature, type in the console on one of our servers "/sclogin letmesee". To turn off the shoutcaster mode, type "/sclogout".
It is possible to safely play on as many as 250 fps - com_maxfps CVAR is no longer limited to 125, as some framerate issues has been fixed.
Development of Legacy mod might not be the fastest but is still ongoing compared to ETPro - which stopped 15 years ago. It is safe to say, that the ETPro's source code will never be made public and its development is dead.
"dropobj" command has been added - you can now drop the obj without selfkilling.
Be aware that some spawnpoints numbers are different in Legacy compared to ETPro - you might need to check it yourself. An example might be first stage goldrush spawnpoint to spawn back as Axis.

Credits: @ryzyk_krzysiek