Buy every stock in Roth?

I use basic $6k roth and the mega Roth of $58k(minus 401k).
My question is that if one only buys for long term investments should one buy only through Roth to save tax, or is there a reason to buy some stocks in a normal trading account. Only reason I can think of going for latter is if you want to sell off before the age of 59.
Is there anything else you think of while investing?