if you are planning to hold coins for a long time, the best coin for you is namecoin without any doubt.
the only problem is that it is the second hardest coin to mine (after bitcoin).
if you want to make money trough mining coins, the best coins for you are 1. catcoin 2. bitbar 3. globalcoin especially when you can hold them for a long time but if you can't you can mine litecoin and sell instantly and still earn much from it
lottocoin and dogecoin are also a good bet but lottocoin is largly based on luck and dogecoin even more!