In my opinion there is no difference between bounty companies with a large pool and a small one. The difference is only in the price of the coin. Since in companies with a large pool you can get a lot of coins that will cost very little. But fooling both of them. Passed the time when it was possible to get a lot of coins and in the future to wait for an increase in the price of them. Now you need to find a project that will not deceive you. Big will pool or a small this not it is important.