Every people love wallet which low fee, can be editing manual fee and have RBF feature, lighting network either. I think which wallet has those features are the best wallet.

then, it depends what address you want to store your Bitcoin, If you want to use bech32 a.k.a Native Segwit you may use Electrum. as copay doesn't support bech32 address to be sure you have to try electrum which address begin bc1 as low fee.