we usually do both to use our Park Hopper Plus entitlements and for a breather on the days after late extra magic hours at the parks when we can't get up to rope drop. They're both great parks and both are worth experiencing. A few thoughts:
1. resort buses don't run direct to water parks. As a result, we use Uber. We never do any bus ride that requires a transfer. But keep in mind that if you get in an uber the least bit wet the driver can and probably will charge you a cleaning fee. We made this mistake once and had a driver try to gouge us $150. We ended up paying $80. Keep this in mind if you're rushing out of the water park in a rainstorm.
2. We do make the short bus trip literally across the street from TL to Disney Springs for lots of great dinner choices after an afternoon in that park. BB has the on-site Winter Summerland mini golf course. If you book a package through Disney travel, they give you four free vouchers for mini golf that you can use there (before 4:00 pm) to make it a really fun day.
3. I'm sure Disney does as well as anyone at health and safety, but someone in our party almost always gets sick, sometimes several of us, and we've become convinced it is because we hit a water park on the first day while we are waiting for our room. This year two of us got sick. I just think that many people from all over the world together in the water make it a very conducive environment to get exposed to germs that you're not accustomed to. True of everything at Disney World but we think the water parks are just a different level of exposure. Ear infections and things that are hard to pin on the flight. Again, I think Disney parks are super clean and they do their best, and it's hard to pin the source of germs down, but we've decided to stop doing the water parks after we spent the last day of our trip this week at Urgent Care with an inner and outer ear infection.