The size of the acoustic you choose makes a massive difference to not only how it feels to play, but also the sound that is produced - so make sure you choose wisely.
You may want to opt for a smaller guitar for a tighter, more controlled sound. Concert, Grand Auditorium and Parlor all offer their own unique characteristics, but the one thing they have in common is a very focused tone, with not too much low-end. This means these guitars play well with others, as you don't need to EQ out all the extra bass energy.
In contrast, the humble Dreadnought and Jumbo deliver a deeper sound and increased bottom end. This is due to their larger size. It's no surprise that these models are firm favorites of singer-songwriters playing unaccompanied, as they contain the entire frequency spectrum, meaning they sound fantastic on their own.
Of course, this larger sound can get lost in a band situation, though, as the extra bass and low-mid frequencies interfere with a bass guitar or kick drum - so keep that in mind when making your decision.