I'm a holder and follower both of these. Rebellius goes with strong but little steps. On the BitWhite side has a big potential. BTW has low supply, good technological infrastructure, strong community. I'm sure these will be good.
Rebellious and bitcoinwhite ?
Is the OP seriously kidding us right now or he is just trying to drive some attention to himself ?
First, why those coins for $50k investment ?
Secondly, asking for opinion with some coins that are just very new on the block when you want to invest that huge amount of money ?
Sorry but all those are questionable and does not look realistic to me. If you have that amount anyway, and you are investing all on a single coin or just both and saying that is the only best one so far, then maybe you have not really done any research and probably need to get back doing more.