Reading all about them may make you want them more
I have a fisher's x black masked lovebird who's 9. and I've also had 2 lutino peach faced lovebirds. the most common lovebirds you'll find in captivity is going to be peach-faced lovebirds and their 23904820938409 various amounts of mutations!!!! Which given different names -- keep in mind are all still PEACH FACED LOVEBIRDS!!! Lol.
And then there's the "white-eye ring" group of lovebirds which are black masked and fishers which also come in a variety of diluted, to white, to blue, indigo, grey mutations etc. And based on some readings, the major difference between the 2 groups of the most commonly kept lovebirds is with regards to their ecology and thus influence their behaviour as well as their diet.
fisher's lovebirds for example are more related to hanging parrots or I think even fig parrots more so than their peach-faced cousins because they occupy different niches in the wild, and thus vary in diet. I believe these guys eat more veggies and fruit compared to peach-faced lovebirds. And as for noise level, I've never noticed a difference, other than 2 lovebirds are always louder than 1!!!! But their chirps are quite similar in sound and volume in my opinion...but after 9 years of living with a lovebird, I may have become more habituated Lol.
Physical difference asides from colour is that I find the birds in the "white eye ring" group are slightly smaller than peach-faced lovebirds. But if you receive a well socialized lovebird down the road from a reputable breeder, any lovebird will be a joy to have!!!
There is also other much more rare species of lovebirds that you may not come across, and their personalities are much less known, and only 1 specie of lovebird is native to Madagascar.