GOG vs Steam version

[The Stalker]

Hi, I recently ended up buying IL-2 (again) this time on gog.com since I like gog's no DRM policy etc. but I already own it on steam.

My question is, which version do you think is better and did GOG change anything in the executable? I heard somewhere that they forced vsync, is this true?

Anyway, I'm planning to get the SAS ModAct since it's a small mod and covers everything that I need improved (mainly sounds).

Any difference between the versions I should be aware of?

Thanks