I have both and wouldn't really see a reason to look for one more than the other.
Temperament - fundamentally, they are quite a like. I find differences will be found more on an individual to individual basis more than species basis.
Quieter - wouldn't say one is noisier than the other. Both are quite capable of doing the high pitch Poicephalus call but I wouldn't say either of mine is noisier than the other. I find them quite quiet for parrots.
Cuddlier - again, I think this is an individual to individual thing.
Sociable/friendlier - this, I believe has more to do with how a bird is raised. If properly socialized from an early stage, and kept socialized, then chances are that bird will be sociable and friendly. I think Senegals have the worst reputation on that front, of being a one person bird, but here my Senegal is the least so, because I socialized her early on. Both my Red-bellieds I got when they were older and they needed a bit more work because they weren't socialized the same way but they are coming around. The RBs I found to be more clownish and will "show off" more in front of company.