I think there's a useful distinction between product analytics, which might include basic details about web usage but likely in a privacy preserving way, and actual web history.
All of the browsers, Sigma OS included, are going to do product analytics. But I'm not sure that any are going to actually track web history. They'll track what web features you're using, and Chrome is known to track domains but I believe in a statistical way that doesn't give perfect info on who's using what. They all sync some state if you sign in, but that's a feature not analytics, if you trust them, and Sigma is no different here.
Apart from browsers like Brave selling ad space or dodgy Android browsers selling full web history, I'm not sure that any of the major players are actually doing anything fundamentally different to what Sigma is here. Firefox and Safari push the privacy side a little harder in their own ways, but are still roughly equivalent I think.