Ultimately it’s very hard to go wrong when choosing a guinea pig. Many owners found that they had a dream pet in mind, with the coat type and colour all picked out, but on their search they fell in love with a guinea pig they just had to have. If this happens to you, then there’s almost nothing stopping you for going for whichever guinea pig you like. Just have a think about which breed would suit your time requirements - the main question is how long do you want to spend on grooming? If the answer is not long at all, then you’re best off opting for a short-haired breed.
Some breeds of guinea pig have extraordinarily long hair
The various guinea pig breeds have not been separated long enough to really develop any differences in attitude or temperament, so there’s no real difference in personality between breeds. Rest assured that in this respect all you need to do is pick one that you like the look of.