I'm not a fan of Tether, as I think it has contributed to the fall in the overall market. Tether makes it too easy for investors to jump in and out of other coins. I know it is a popular coin, but for me it does nothing for the crypto market in general, if anything, it detracts from it. And not sure what you're talking about with Ripple (guessing because it's centralised?), but they're nothing alike.