[mdeck]

I believe if the stakes are too significant in a literal sense, then you are playing above your comfort level and while your bankroll may be large enough to withstand the swings of 5/10 emotionally you may be unable to. This in turn might lead to tilt, which causes you to play a less-than-optimal game.

Are you saying you have constant 120BB swings? I know that swings happen, but if you're swinging that big with any regularity that I'd suspect that something is irregular with your game.

I think if you aren't prepared to handle the swings of 5/10 monetarily, you should stay at 3/6 for a while until the dollar amounts are more palpable.

You already answered your own question. Play where you are most comfortable.