I don't think breed matters as much as personalities of each cat. Before getting the 2nd cat, have you looked into doing proper introductions first? If not, I'd suggest reading from several resources (including our forum) and preparing yourself (and household) for some extra work and diligence to ensure a proper feline integration without too much stress on your cats and yourself and family members. So many people neglect doing the research needed ahead of time, and well...sometimes that neglect can work against them.
Kittens are easier for an older cat to get along with (since smaller kittens are less intimidating), but members also underestimate their care. You'd need to kitten-proof your entire home, make sure you've pre-selected a "saferoom" for the kitten for a few days minimum, give frequent feedings, provide more litter boxes, vet care, vaccinations, dewormings, licensing fees, etc. If you are well aware of all these things, I think you'd be fine.