I have been using JandC warmtone for a couple of weeks, and have been happy with it. Look at my personal gallery for some examples with Neutol WA. I don't use dektol, so can't help you there. I have never used iford warmtone either. Sorry.
What I can tell you is that this paper is a bit softer on the contrast than most papers I've used (but it's the first warmtone paper I have ever used). It's not a big deal, though.
Wish I could help you more, but I'm sure someone here can fill the gaps.
You can expect a more rich print. The blacks can be deep, the whites are nice, and overall, in my experience, the tone is richer. In my opinion, it beats the Ilford WT if you want a rich warm tone look.