@ Milagro, Pokerstars is not as loose as Party is. This is not such a loose game as the list that ED Miller would be talking about. Limping with A7s UTG in a 10 man game on a significantly tight / stronger game than party is incorrect.

I would however tell you that bet / calling is a far better line.

A) MP1 is more likely to call your bet.
B) Bet / Calling will build a bigger pot, it also allows you bet out a flush and perhaps getting a call / overcall again due to the potsize.

Check / Calling also has its merits as sometimes (not often) it may get checked through and you have infinite odds to hit your flush.