by saying big, you mean tall? i guess they have an advantage in terms of reach because their arms are probably longer so are their legs. they can easily grasp those which shorter people could not

but what about guys that are on the heavy side? it's easy for me to climb bec. i'm not that heavy although i'm kinda short.

It all depends on the route/problem. I've set some competition climbs which were VERY difficult for tall people. Kids love it when they can do a bouldering problem that older kids/adults can't do because of their height. It's also easy to set route/problems which shorter people can't do because of reach. Some people are talented at slopers, crimpers, pinches, stemming, small pockets... and other have difficulties with them. That's the great thing about climbing. The variety of climbs/problems and climbers.

What is everyone calling tall/heavy. I am 5'11" 200lbs, definatly not tall but maybe on the heavy side. Heavy being heavy not a polite way of saying fat.

Im 6' 4" 215 and find it both frustrating and nice. bouldering sucks cause usually im hunkered down and can jump and finish the problem. on longer routes its nice cause i can reach those holds that my shorter friends cant, making it easier.

Tall has the reach advantage, but shorter has the advatage when you get tucked or feet are high and close to your hands. Smearing eliminates the reachy issue. Good technique is the secret :) Just look at Robyn Ebersfield, she is 5 foot or so and one of the best climbers ever!

Where was your picture taken?

That picture was taken at Summersville Lake, WV near the New River Gorge.