May has great pool weather in central FL. A week is a nice, long stay and it'll be tiring and hot at the parks. Most 7- and 10-year-old kids love swimming pools, playground slides & pool slides, and kid-friendly activities on vacation. You'll likely want to plan on either daily pool/rest breaks or a resort/pool day or two during your May trip. You won't have strollers to unload for buses or pack into a car, so that's not a concern. Most kids like the monorail and ferry rides (some ask to ride them, even if they don't need to), so I don't consider the need to use them, neither pro nor con, except when you're in a hurry.
Given your list, the ages of your children, the time of year, and the length of your stay, I'd eliminate the AKL/AKV studio. If your kids are adventurous eaters, there's very good food but very little variety for a weeklong vacation. This may or may not matter, depending on how often you expect to eat in your room, in the parks, at other resorts, or at the resort where you're staying. With numerous bus rides to/from the parks for a week, I think the waits for buses and long bus rides (especially to/from MK) would get old fast. Also, most of the rooms are a loooong walk from the pool areas and/or from the bus stop. Time and energy.
In your case, I'd also eliminate the OKW studio for similar reasons. While the bus drives are not as long to the parks, add time for the 5 different resort bus stops, sometimes delayed for boarding/exiting
ECV's. Again, the food options are not varied for a weeklong vacation. Also, while there are several pools, only the main pool offers a pool slide and other kid-friendly activities. However, you're not likely to get a room near the main feature pool because it's popular and a points upcharge to reserve in that area of this sprawling resort. So from your room, easy access to a pool will be to a basic, quiet, hotel-style pool. It's a loooong walk or an internal bus ride to go to the feature pool area. Time and energy.
The BCV studio is in an excellent location for your situation. Super convenient to 2 parks (especially for midday breaks) and wonderful pools for your kids. Ouch, that's expensive, and the room is small. But the location is absolutely awesome, including plentiful restaurants nearby, within walking distance. You just need to decide whether the higher cost is worth the convenience of the location, next to EP/HS, for your family. Note that at times, the buses to the other 2 parks (MK, AK) may make stops at YC and BWV, which adds time to the ride. So if your family will focus on those 2 parks more than on EP/HS, the convenient location will be less significant for your situation.
The WBC offers wonderful pools as well. IMO, the layout of the pool slides and floating rivers are better here for families with 7 & 10 yr old kids than at BCV. Also, the walk from any room to a pool with slide and/or floating river is about the same as it would be at BCV (shorter than at OKW or AKV). WBC has more kid-friendly activities within easy walking distance of all rooms than any of the other resorts listed with a good playground, onsite (free) mini-golf, etc. Restaurant food options within walking distance are limited to the resort and adjacent Wyndham Grand hotel. But the kitchen is fully accessorized so easy breakfasts and convenience dinners can save time and money, especially if the kids are picky or unpredictable eaters. Driving to/from the parks takes no longer from WBC than it does from OKW or bus rides from other onsite resorts. The time taken to walk from your car to theme park gates is a wash, vs. standing in line to wait for a resort shuttle bus (except at TTC/MK). The flexibility of your own car (or Uber) is a plus.
Most importantly for us, having a separate BR for the kids makes it a better vacation for everyone... the kids settle down for better sleep behind a closed door, while parents can still be up with lights on, can prepare for the morning, and can have some privacy during precious vacation time off from work. A week in a studio/hotel room with kids is really not conducive to adult relaxation, IMO. YMMV.
