Hmmm, not that I can think of. If it's not a Russian Imperial Stout or something, it probably won't require a whole lot of aging (which I assume you wouldn't want to do in a keg, unless you have a lot of spare kegs).
Of course, there's always the benefit of being able to take beer with you to share or what-not when you bottle, versus kegging. But kegging has its share of benefits too, naturally.