Going by the list you've compiled, I'd strongly vote for PS4 (and keep your xbox360). I own neither, but that is also my personal opinion.
-company loyalty is stupid, if you ask me. It's not because they were your favorite in the past that you should be obliged to buy their stuff now.
-the bragging rights...leaving my personal opinion on that aside, you can still keep your 360. No doubt there'll be plenty of games you haven't played, so you can get achievements on those.
-how is that 'cloud' a point for the xbone? Doesn't PS4 has a similar thing?
-you already have PS+. That means you already have a collection of PS4 games pretty much from the get-go.
-you prefer the PS4 exclusives over the xbone exclusives.
The only real argument that holds a value, IMO, is the controller. No matter how you slice it, that IS an important factor. If it wasn't for the above arguments (which, combined, form a stronger argument...again: in my opinion), I'd say "go for the xbone". But as it stands, it's no real competition: you want a PS4 over an xbone.