Hi Denise
We have been to both these sites, and I must say we prefered Ross Park.
Don't get me wrong the pitches and toilet facilities at Dornafield is very good, but there is a very narrow entrance into this site, with brick walls either side, so it can be a bit of fun and games getting your van in. The shop is very small, and the local pub is down a long narrow lane, not suitable for walking with little ones.
Ross Park has a great dog walk, lovely pitches, and a nice restaurant. We also have a 13 year old boy, and the games room facilies were much better for him at Ross.
However both sites are really nice, I think it will come down to personal preferance.
Good luck
Tracy