Tiffany Schlumberger designs will always be a little over the top and super decorative. But for this piece, it's my favorite design of the three and it sounds like you feel the same way too.
Of the 3 brands, you gotta look at the main diamond size. Van Cleef and Cartier charge a lot just for their brands "compared" to Tiffany. So value wise, again I choose Tiffany.
With the special savings you can get on Tiffany, that sounds like a deal too good to pass up. Well, anyway, we're here for support. Just my 2 cents.