Who would win between Thanos and Lord English?

Stalemate. Thanos has an immense control over reality, but the laws of Paradox Space itself bend to LE’s will. If Thanos killed LE, all he’d be doing is create a Doomed Timeline, and with Thanos having the full Infinity Gauntlet, I don’t even know if it’d be possible to take him down. So, likely stalemate.