Been debating this one with the lads at work and even though I live and die for surfing I'd still say Snowboarding holiday.  mainly because if you were to go on a snowboarding holiday how much time do you actually get on your feet.  With surfing you could go on a 2 week surfing trip and if the swell doesn't play ball and there's crowds actual time spent up is limited.

Yep I agree.  But I don't think I'd book a snowboarding holiday in August!!