I haven’t read IT yet because they didn’t have it at any nearby libraries or stores but I have read the Body (stand by me’s basis) and Have watched both IT and Stand by Me.
So I will base this off
2017 IT
1986 Stand by Me
1982The Body
1990 IT Miniseries
2019 It Chapter 2
If the 2 fought as teenagers then I feel Henry could win or Ace would win.
But if they were adults I feel like Henry would win. By the end of The Body,
Gordie LaChance Describes Ace as covered in flesh and basically fat.
So I feel like Henry Would win.