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 

 The features in samourai are enough to get an android phone, just to get the best mobile wallet ever made.