We're going in May. We chose VV. The 2 bedrooms are bigger and look much more comfortable. Ammenities include full kitchen and washer /dryer. HIFS Kidsuite has only microwave and mini fridge.
The pools are comprable - both nice zero entry types with things to do. But at the HIFS pool, our 4 year old would have to wear a swim diaper. That doesn't really suit us. Both hotels have some kind of kids' program available.
HIFS has free breakfast, and kids eat free. Not true at VV.
If you think you'll actually use the full kitchen and washer/dryer, or like alot of space to spread out, I'd say go for VV. We'd prefer to eat breakfast and most suppers in our suites, so we won't miss the food deals at HIFS.
If you don't plan to cook, and don't really care about the extra space, go for HIFS. The free breakfast and kids eat free deal (might apply to only your youngest) could save you alot of money.