Cons: 720p/30fps capped, no mods, dated graphics, no mouse/keyboard.
PC (Enhanced Version)
Pros: 4K/60fps+, ultrawide support, mouse/keyboard precision, mods (maps, skins, campaigns), "Gears of War: UE" remaster includes extra content.
Cons: No local co-op (online only), potential port issues (original PC port was buggy; UE is better), less "authentic" feel for purists.
Verdict
Choose Xbox 360 if: You want split-screen co-op, original 2006 feel, zero setup.
Choose PC if: You want best graphics/performance, mods, mouse/keyboard, single-player focus.
Note on Gears of War: Ultimate Edition (PC/Xbox One)
Remastered campaign, 60fps, improved textures, includes cut content. Best single-player experience on PC. Original Xbox 360 version still best for local co-op.