I don't normally use many mods so I can't really speak for workshop support but my guess would be that Fusion has more support. .. Steam Community
: Powered by an updated Serious Engine 1 with 64-bit compatibility, advanced shader support, and Steamworks integration for achievements and Workshop mod support . Community Reception Serious Sam Classics Revolution
: Includes three "new-ish" weapons found in secrets, such as the Ghost Buster weapon . I don't normally use many mods so I
Revolution or Fusion? :: Serious Sam Classics - Steam Community advanced shader support
: Some users report performance issues , bugs in the new campaign, and desync problems in multiplayer.