I've got lots of both.
I'd hate to give up either - they're both a huge part of my Viking persona.
If I had to, I guess I'd keep the muscle and lose the hair. 90% of the time it's in a pony tail anyway.
Well, I do have hair, never been really puny these late years, but last summer I tried shaving my head, and bulk up some serious mass. I tell you this, I've never been hit on so many times before. It was a big difference from when I was smaller with hair... It felt great. But, always a but... I ended up with my girlfriend (for the time being), and she loves hair. I decided to grow some again, just for her -DOH -, I still get hit on once in a while (lost my sex appeal perhaps?), but no way near as many times as I used to... I'm 25, and experienced chicks from the age 18-40+ trying to hit on me... Oh well..if this relationship go crash and burn, at least I know what I'll do.