I also have never had the whites, but have kept the Yellow's before and loved them

They're one of the more peaceful species of Mbuna and have a much higher tolerance of lower ph that some of the other Rift Lake cichlids. The need to be kept in groups with a ratio of around one male to three females. Depending on your tank size, it might be better to stick with just a single male. They are territorial and each male generally claims around 30 to 40 gallons of tank space for his little private kingdom. In a 55 gallon tank, one male and three to five females would be a good group.
They are pretty tolerant of other species as well, which is unusual for Mbuna. IMO they make a nice colour contrast for some of the blue Peacocks, and are placid enough not to cause problems for the Peacocks. I found them easy to breed once mature, although I never got more than 5 fry from a spawning as I just let nature take its course and didn't interfere.
The biggest difference I've found with Yellow's as opposed to other Mbuna is that they need more protein in their diet than your average Mbuna. Not quite as much as SA/CA cichlids, but they tend more towards being omnivores than herbivores. They are not prone to the bloat that other Mbuna can get from too much protein in their diet.
HTH