The default keyboard is not bad, and has both decent text prediction and text swipe. Plus it doesn’t send your data to a 3rd party.

Yeah default one is the best, but you can try Grammarly one. It’s basically the same but you can add number row, although globe icon in the corner would return you on default iPhone keyboard

I used swiftkey on android since before Microsoft acquired them, then I got an iPhone and swiftkey, but they made it shit. Since then I use the default one. It’s acceptable. Multilingual text prediction is kind of weird to implement, and only works for 2 languages.

I use FUTO on all my android devices. It’s amazing and it’s free (donating possible) and respects your privacy - but sadly not available on Apple.