I would go for the kribs , they may be easier to sex . Ive heard rams can be unreliable parents , I've had kribs and they seem to care for the fry well ......until another clutch .[ that is If you want them to breed ] . Many plants and a few retreats will make them feel comfortable . Oh cockatoo cichlids[ apistos ] are also a nice choice., as long as you're still in the planning stage .