probably not as many large areas but there would be spaces where 4 and 5 cts could camp, probably could get quite a few in at ocean lake. Heres some pros and cons for both.
Dundy pros - closer to the touristy things, an hours less drive to get there, good campground, larger areas to camp on the beach
Dundy cons - very busy beach (not kid friendly) generally its bloody windy, can be quite crowded
orchid pros - more protected from the wind, better camp sites ( more shaded areas), less crowded, no backpackers, can launch boats at waddy
orchid cons - bit of a hike to get up there, to far to go and do the touristy things, no backpackers.
The fishing can be good at both but there is more options at orchid (beach fishing in gutters, boat, rock fishing or if the wind comes up its only a half hour drive to wathumba creek on the western side)
could probably add more but that will do for now, if anyone has any questions i'll do my best to help out
Cheers Shane