mobile there is no clear best, there are a bunch of good wallets with different tradeoffs

my favorite mobile on-chain wallet is samourai, but that is android only, without lightning support

other good options:
muun - extremely easy to use - https://werunbtc.com/muun
phoenix - great for lightning payments - https://werunbtc.com/phoenix
bluewallet - many features, easy to connect to your own node, can be used with multisig
breez - similar to phoenix, great for lightning, with a slick point of sale mode
zeus - the best way to use your own lightning node
blixt - great for lightning
nunchuk - nfc support so works well with tapsigners, easy multisig, iOS version is closed source