I've been android for years, but had work iPhones a few tears back, plus my partner's phone is iPhone. I find iOS way harder, so I'd put it down to muscle memory.
It's worth noting that apple are almost certainly better at this sort of UX, it's their biggest selling point. The original iPhone keyboard was one of the hardest things they had to crack, as the screen was literally too small to be accurate, and the amount of predictive letter choice that happens behind the scenes is huge. I don't mean the word prediction, but the letter you choose is figured out from context and how your finger presses the screen.
I do find on GBoard, I make typos frequently enough, but it does reliably correct them. On iOS I spend more time scrubbing back to fix things than actually typing.