very little difference, the longevity of the shorter one may be better...

Ken........

It's a tub: ) either, and both better than your current.

Have tested both heights I see one tells you how many gallons of water maybe see if the other has tha info . It makes no sense to me that th ewater depth is the same in a tub that is higher.

The 68 gallons are identical, Patricia

Both use the same overflow drain kit, so the overflow on both is the same height leaving you with the same water depth. The difference seems to be how much space is between the tub and the floor, interior dimensions look the same.

The only difference is their designed installation. The higher tub has the drain above the subfloor while the lower height one has the drain at the subfloor. As such, the tubs bottom support rails are different depending upon the desired installation and, the front panel, if desired will be different in height. Otherwise the tubs are identical in style and capacity.

Overthinking things is what i do Jan 😂

Yes.............it is a tub, Ken : )

We have a Kohler tub/shower alcove on our 2nd floor, and chose to put another Kohler "larger, deeper" tub in our master bath.

I was frustrated when it turned out that only the unit itself is larger! The interior tub dimensions are the same!

(It would have been nice if Kohler made a note of this in the description, as I now assume it's to accommodate replacement situations.)

The "larger" tub just has a taller, deeper front, and a large ledge all the way around the inside edge.)

So get the one that works best in your situation which is what is missing in this issue. Have you teasted them both for ease of entry . One of my clients has now got knee issues and finds the nice deep tub we installed 8 yrs a go is now a bit hard to get in and ond out of .

I have this tub , the "tall" version, and love it. We installed a 12" vertical grab bar to aid in stepping over the side (I am short).