I want to buy some Tether USDT.
but the bitgo wallet don't have Tether wallet.
Which wallet is the best for USDT?
You can simply use Trust Wallet to hold USDT. Trust Wallet is available for all blockchains, so you can save any version of USDT, not just ERC20, or BEP20. Apart from that, you can also exchange them for other coins from the wallet by swapping.