Since this post isn't going anywhere I am gonna post some pros and cons on the two species
Cockatiel-pros
Their good companion birds
Very affectionate
Cuddly
Entertaining
Bite doesn't hurt
Aren't that nippy
Cockatiel-cons
Very dusty like most cockatoos
Will start self plucking if left alone
Provide a verity of perches toys
Not the best at tricks
Whistlers not talkers
Lovebirds-pros
Colourful
Small
Entertaining
Lovebird-cons
Nippy
Recommend at least two
Is two birds, they will bond to each other even is hand reared
Less dusty
Not talkers
Not the best at tricks
I've probably left heaps out add to it