I dont know why I dont feel the same quality as the plini plug-in, that one sounds really full and musical.
The models aren't made by the same people who made the plugins, it's a completely different team. That's according to Dan over at NDSP. I always wondered why basically every youtuber put all their focus into the capture feature and almost none into the amp models or effects: it's because IMO they aren't really that great but who knows what updates will bring. I never buy a piece of gear based on "future promises" though, my only experience with one has been a few hours messing with it at a buddies studio and messing with peoples "comparisons" they've been posting.
As far as the captures it's less effort for basically the same result to me. Kemper profiles don't come out the gate screaming "look how close I am" you have to do tweaking after the fact to get it there but if you just take the extra few minutes to do that you end up at the same result. It's one of those things where with a good ear you can tell there is a slight difference between a capture and a well made kemper profile of the same thing if it's just a solo guitar in mono but once you double track and throw it in a mix you're just taking wild guesses at that point which is which. The QC is really good for someone who doesn't already own something high end like a Axe-FX or a Kemper but I wouldn't rush off selling either of those units for a QC just yet.