What I have learned from the crypto market is basic and simple, when the market is bearish or uncertain, it is best to trade the altcoins/usd or usdt, and when the bitcoin market is rising or is in a good price range it is better to do the altcoin/bitcoin pair, that is what I have seen, of course, the pairs that are altcoin/usd or usdt are few, but they are the best tradable, that is my advice, there will be some who operate in other ways, but for me things in trading work like this.