The 24" bmx might work fine, being able to lower & raise the seat on that and you might use it as an easy riding cruiser style bike. The 20" that way is probably more like a single speed folding bike without the luxury of being able to fold & break it down. Like others are saying though, I wouldn't expect it to keep up with a longer distance, especially when your friends are really mashing away for a quick ride to point b.