We've done both over the last couple of years with small DCs, although I had the advantage of being PT / on maternity leave, and DD hadn't started school, so I have been on that kind of holiday.
We're enjoying the loveliest family break at the seaside, and a whole week has cost us £250 for accommodation every bit as Good as Bluestone - better, in fact, as it's quiet and we have a private garden and are on a farm. Granted we'be had the benefit of fantastic weather, but if we hadn't we could've done the same sorts of indoor activities as at a resort and paid less for them. I remember paying £6 for a short and pretty lame kite making session at Bluestone and similar for half an hour or so of messy play at CP. Why?! We'll never bother again.
Just makes me cross that resort holidays are so extortionately priced - nearly 6 x more for Bluestone for the same week, and more for Center Parcs. Independent hols are so much better value.