what could be the best bankroll coin to invest with? i'm currently afraid on investing to litecoin bankroll since the last time a user almost swept the litecoin bankroll but their ltc investment of 35% on commission is a great promotion and seen that they have extended it to december.
Hard to say, LTC typically has the most action on it and therefore has the highest chance for gains (and losses as you point out). I personally recommend diversifying, so spreading out among all the coins. That mitigates some of the risk because then you can't lose all your investment.
Example: you have $300 to invest, so you put 100 into BTC, 100 into LTC, and 100 into doge. If someone comes and wipes the LTC bankroll you still have the $200 from BTC/doge. Whereas if you put all of it in on one you have no other investments to help balance out any hits.