Mix is good, it can get awkward in third person when it is obvious the MCs face is always conveniently not visible...then again the way some of the MCs look makes we think that's not such a bad idea lol
Both can be good, the most important thing is how they are used imo. If the framing is bad it doesn't matter whether it's POV or 3rd person, the scene won't be very good
Mixed is definitely best even though I hit 3rd on the poll. Either option alone can lead to some mediocre camera angles, but half of that problem falls on the game dev.