The Ultra costs more, but is thicker.... lifetime warranty for home use and 10 year warranty for commercial use.

They are made of thicker plastic, tougher, and odor/juices won't leak through.

I prefer them over tile also because grout has to be maintained and cleaned and the thickness of tile over backer makes for a thicker installation.

Yes, grow a thicker skin.

Its been a true blessing to have gone to the weeds of it and grow thicker skin!

Why not the thicker floating vinyl?

Your best bet is to either add another layer of subfloor (the thicker you can go the better but obviously this can cause problems for transition areas that you may not be adding subfloor to), or use either floor leveler or floor mud to help even out the floor.

Most painters think that thicker is better and keeping the paint too thick is the worse thing most painters do.

It makes it much thicker. 

It’s more expensive, but is thicker and has a thicker wear layer.