The verdict
For a small B2B team with a marketing site, a blog and a few landing pages, I'd pick Plausible. The whole team will open it, and that matters more than depth. Add Contentsquare only when you have a busy site with a clear funnel, such as a signup or a webshop, and someone whose job is to act on what the recordings show.
They are not rivals in most set-ups. Contentsquare does not replace a web analytics tool in the way Plausible does for a small site, and Plausible has no replays or heatmaps at all. If you want to try the behaviour side before committing, Contentsquare has a free tier for experience analytics, and a lighter free tool such as Microsoft Clarity may be enough at first.