Hi,
We have stayed at both and actually all 3 of their orlando Locations.
Parc Soliel is new, it opened about a year ago or so. The pool is quite large, and has a water slide and is more remote. The hotel does not have as many activities scheduled throughout the day. Its a very calm relaxing place to stay. The one bedroom units have a large tub with a waterfall foucet, which is kinda fun and neat. Last time we were at this location they were building tower 2 which I believe is finished but they are most likely doing some work for another, its going to be a huge resort when its completed. Noise wasn't a problem but you could see the construction. I just give that as an FYI, I don't think it would cause any major problems.
HGVC @ Sea World is a great resort. Its a bit spread out. They do have lots of activities by the pool, and some are free and some cost. When we were there they did have a large outdoor screen they showed movies at by the pool, they had sundaes, and movies in their theater. This one also has more places to eat at the resort, ie piza hut and a market. both of them have pool bars but I liked the sea world one more. Location is great as it sits across the street from sea world and is about a 10 min walk, it can be hot however in the summer.
You really can't go wrong with either it just depends upon your personal preferences.
Sorry forgot one thing, if you have a facebook account they have lots of photo's of both resorts on their page. its under Hilton Grand Vacations I think.
Nathan