Round bars are still made, but they’re only designed to work naturally with the old style Yakima rain gutter towers, so they shouldn’t be a concern or consideration. With your Pilot, if you have raised side rails, you’ll be getting either a Yakima or Thule system designed for that, and the default will be aero bars from Yakima or aero or square bars from Thule.
Hullavators are ideal if someone has strength or mobility issues that would preclude them loading a boat straight into a j-cradle or onto a saddle. They’re a little fiddly to assemble, a little heavy by themselves, and take a bit to install or remove, but they’re a godsend for some folks who simply wouldn’t be able to load the boat without the design and the aid of the gas pistons.
If you like the idea of a side-loading upright carrier, Yakima has an alternative called the Showdown that is a little simpler to install and remove, quite a bit lighter in weight, and less expensive. It does NOT have the gas assist lifting element, so you need to be able to dead lift the boat up to the point where you can slide it over the bars, but if you’re of normal strength and condition, you should be able to manage it.
In either case, make sure that the crossbars extend out over the side of the roofline enough to allow clearance for the carrier to be down without hitting the doors of your car. I’ve seen some folks scratch up their cars with bars that weren’t quite long enough, and it wasn’t a happy experience for them. Note that Yakima’s raised rail system is much easier to work with if someone wants longer than normal bars, as the tower can be positioned anywhere along the length of the bar.
Word to the wise that lead time on both the Hullavator and the Showdown are in the 3 to 5 month range, so best to get moving and find a dealer that has them on order to get in queue now. It’s going to be another one of those years in 2022…