OK, my opinion.
Malawi...color. The color range doesn't get much better. The broadest range of attitude.
Tanganyika...personality and oddities. A community tank is more possible with the right mix of Tangs.
Victoria...this is my baby. A lot of the species are endangered. I think that in itself is reason enough to have a colony of Victorians. But, some of the fish are absolutely gorgeous, the attitude range is from mild mbuna to fairly aggressive mbuna. Can be mixed with some mbuna and haps. Hearty fish. Breeds early.
lol seems biased twards victoria. :evil_lol: