I recall no difference between the bathrooms of the deluxe and presidential units, but my memory may be failing me. The large tub is in the master bedroom of both units. It is a large tub that may be jetted, but not sure about it.
The 1, 2 and 3BR presidential units are all in Tower 6 on the upper floors, which is a great location.
You get a full-size washer and dryer instead of a stacked unit.
The decor looks a little more upscale and you have stainless appliances. The rooms might be slightly larger.
Some of the presidential units only sleep 6 instead of 8 because they don't have a couch bed.
What you really want to know is if it is worth paying more for one. For me, no way. I have stayed in them because they were available for the dates I wanted, but I would not pay $300 more for one if a Deluxe room was available.