In my opinion, the best Bitcoin wallet for Android is the Bitcoin Wallet (also known as Schildbach wallet).
Is the wallet supporting opt-in RBF and coin control?
OP asked for clients with multi-coin support. Blue Wallet and Electrum are bitcoin-only wallets.
Maybe that is not well explained, but that was what I meant, that I do not know much about altcoin wallets, that the best would be to just go for hardware wallet because no much option for open source online wallets.
Yes, Electrum and Bluewallet are obviously bitcoin wallets.