An undermount is much easier to sit on the ledge and swivel around to get in the tub. When you're naked, (or even if you're not!) it's just not that comfortable to sit on a ledge with a ridge in it that cuts into your legs or backside.

Grab bars can be placed on the wall to the side of the tub entry at any point if you install the blocking needed in the walls before they are closed up. Be sure to place the Roman tub faucet on the deck appropriately to give you the room you need to enter and exit and still be able to reach it from the exterior. And be sure and get the option with the hand held sprayer to be able to actually clean the tub! It can work for rinsing shampoo out of the kids hair too, if you let them use your tub.

Thanks! (you've always been so helpful with my questions)

I didn't think of that aspect. I was actually thinking about the drop-in being more comfortable when you are in the bath since the lip gives a bit of a head rest aspect.

I think I am going with the undermount option but I keep obsessing about "what if the air tub breaks" as I don't know how one would remove it without possibly breaking the deck (granite). The store where I bought the tub did recommend undermount for the looks.

Thanks! Which airtub are you going with?