First order of business... Welcome to TB.
I might suggest, that along with your question, you add a little brackground about why you're asking.
If it's just out if general curiousity, that's fine. And you'll get a lot of opinions and probably not much consensus.
However, if you have something in mind that you're going to do with a 15, you might want include that.
It can help everyone focus better on whatever needs you have.
And expect things to get out of control a bit. Probably in a good crazy way. We're all just a bit off center around here.
We like to argue, have fun, and go off the rails now and then. Just thought I'd warn you.
Anyway, I hope you find out what your looking for.