One cannot say which one is better than the other. It is up to the individual what he would prefer(I was surface, but initally was a sub vol).
There are MANY(read use SEARCH feature) threads based entirely to this subject. In the end, what it all boils down to is what will fit better with what you want. Smaller groups of people, more places available to pull into foreign ports, wider range of home ports, no sun, hot racking, etc, etc. Or would you rather see sun, get fresh food on a regular basis, get email and phone calls, work with over 5000 people, long chow lines, and work with women(some people have strong feelings one way or another about this, therefore it must be a consideration for some).
Personally I wish they would bring back CGN's because to me they combined the best of both worlds, plus you didn't have to deal with Airdales or coners(alas there are still other non-nukes but not in such high quantities).
In the end, I was a sub Vol, wanted a boat out of San Dog or Hawaii and ended up as the only Mechanic from my class in Charleston to go to the Stennis when she was still in San Diego. Go figure.