Plus: Unlike Palemoon, when Falkon decides to have an issue, one or more tabs fail to load, but the browser itself doesn't crash.
Minus: It really needs something like NoScript, where all #JavaScript is off, except for specific sites you authorize; it cannot load PleromaFE and cannot log in with Soapbox. I should have tried Bloat, but I didn't. Although I don't knowingly have any Snaps installed, snapd randomly spins all CPU cores at 100% for a few minutes ... this was never observed with Palemoon.
My 2¢ after playing with #Falkon for a little bit:
1. Falkon might be more resource-efficient on a Qt-based desktop than others -- or if you run a lot of Qt apps in general, particularly those that make use of #QtWebEngine.
2. Falkon's tracking protection is a bit limited, but at least it doesn't phone home out of the box -- which is a problem that both #Chrome and #Firefox have, though you can at least disable this in Firefox.