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 go...
I expect many Bitcoiners use GrapheneOS, and there are some eg Muun that cannot operate on Graphene due to requiring Google services. So for GrapheneOS users Samurai wallet is one of the only options, so far.
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