Hi kmk9,
A forum search on SleepEz Savvy Rest will bring up lots of comments and comparisons between them.
Savvy Rest gives you a choice between two, three, or four 3" layers of either organic Dunlop or 100% Natural Talalay.
SleepEz offers choices between two, three, or four 3" layers or two 3" layers with a top layer of 2" in either blended Talalay, 100% natural Talalay, 100% natural Dunlop and organic Dunlop (on request).
The choice between different types of latex are a personal preference (all latex is a high quality material) and you can read more about the different types of latex in post #6 here.
Phoenix