For web I like hamstr. For iOS I found that nostur is fast but is still very much a work in progress as it’s not currently finding my follows published with other apps.
Two weeks ago Nos was fast and buttery smooth but we introduced some bugs in the rush to Nostr that we now need to fix.
I use Damus as my daily driver. I think it is doing things right that aren’t immediately visible to the user but are the reason it’s the dominant iOS app.