There are many altcoins which are available in the market for trading and investing. But it is up to you decide which you are picking and accordingly invest or trade. For best investment choose BNT and Ripple. And for trading choose TFL, CAPP, NXT etc.
if I personally prefer BNB rather than BNT because in terms of their ranking both BNBs are already in the top 100 of the best coins, and if it is NXT problem, as far as I am, there are many people who lose because prices drop very drastically and it is difficult to rise