The Blue Zaire varieties tend to be prettier than the Burundi, Kigoma (seven stripe) and even some of the Tanzanian blue varieties (e.g. Mpimbwe) but they also tend to take longer to mature, tend to be less fecund (productive) spawners and are more difficult to find and consequently are more expensive to acquire. These are general assessments of course and there can be some exceptions. If you are more interested in a display tank and not so much in breeding them, the blue varieties, especially the Zaire blue varieties are more attractive; if you want to breed them, the non-blue varieties prove easier and much more frequent and productive spawners.
Something else to keep in mind is that there are plenty of hybrids around. Inexperienced hobbyists often collect individual specimens of different varieties and locations of origin, stick them in a tank together and then there's a spawn. These fry are often labeled as "Fronts" and are offered for sale outright or placed into auctions. I'm a purest when it comes to breeding fish so I avoid hybrid fish as a principle. Many of these specimens have phenotypical features that are in between their parents' natural features which can manifest themselves as partial stripes or odd numbers of stripes and even deformities. Too much in -breeding can also cause physical deformities.
Like Ken suggested, fronts all grow to large size at maturity so a six-foot tank would be a far better choice than anything smaller. While they are not known to be aggressive predators, they can and do opportunistically eat smaller tank mates if they get too close to the larger fronts. Cyprichromis species tend to be a favorite natural food for fronts as described by some of the early books on Lake Tanganyikan fishes. Some alpha male fronts are relatively more aggressive than others. Having a larger tank offers the dominated specimens more room to escape the unwanted attention.
There are a variety of online sources of fronts and they are some breeders in Michigan. Personally, I prefer to buy fish of any kind from breeders I know and trust to be offering true strains rather than simply "fronts". That's not important to everyone but it is to me. Ron_Teck is a reliable breeder who periodically has Moba fry available. These are one of the blue Zaire varieties. He sometimes has Burundi front fry available which are non-blue. There are other club members who occasionally offer fronts. Check them out, learn as much as you can and make the best choice for you and your intentions. Good luck!
