For anyone who uses Kucoin I have a couple questions:

What's the best crypto to use for trading on there (least amount of fees, ability to trade for other coins, etc.), BTC, ETH, LTC, TETHER (USDT), USDC?

Since you can't deposit fiat there (I think?) does that make every crypto to crypto trade a taxable event? I'm assuming there's no way around this? I'm a US citizen.

There's some really interesting coins on there I simply cannot find on the other exchanges, and I just can't afford the gas on Uniswap. Any advice is greatly appreciated!