I have a ESS and Field Competition, I will have to say I don't like the stock cheek piece on my ESS but I think I have an old one on there. So I just took a old weibad pad and made it fit. Now its not a problem. I am pretty I have the old buttstock so I cant comment on the new style. Both have the same XLR grip angled not the vertical.
ONLY DIFFERENCE
Cadex smaller thumb shelf
bigger grip area
ESS smaller grip area VS Cadex
ESS bigger thumb shelf but only enough to know the difference not really much bigger
both are awesome i would go with the cadex for 1 reason, if you get a long action you can swap out bottom metal and go with a short or long action calibers. Poor mans AXMC.