Hi, I was thinking of trading between BTC, ETH and maybe a few others such as DOT and ADA but the fact that most traders trade between BTC / USDT or ETH / USDT etc suggests that it's probably a dumb idea that will cost me money. The fact that I need to ask this question probably suggests I shouldn't try it but it seems to me that they go up and down in spurts.

For example ETH has just had a bit of a pump whilst Bitcoin is has been up and down so I've traded some ETH for BTC hoping that I can catch a raise from BTC whilst avoiding any potential correction on ETH. I was wondering if this kind of strategy is something that many people have tried and had much success with or had any bad experiences with?