Hello, title says it all

Some context though, I’ve been a long time WoT player, I think I started back in 2012 then stopped at 2016, then came back on again on 2021, took a break and now I’m back again. A lot of things have changed and I just finished almost all of the StuG campaign (i know, why am I still on the first part, I’m too casual) but haven’t started an SPG line at all. Which SPG line would be good for campaign missions after the current changes?