Well, while jamicus posted my favourite story of the bunch up there ("A Party Breaks Up"), I think a lot of his other stuff pales in comparison but I haven't read too much of his stuff.
Marmot and Izekeal are kind of polar opposites.
Marmot has a weird, drunken, jumbled style I really like that reminds me of... Charles Bukowski meets Philip K. Dick or something and while his style is aimless and sometimes kind of confusing, I still enjoy reading his stuff.
Izekeal is more conventional, some of the stories like Dashiel Hammett/Elmore Leonard meets Hardy Boys and some fantasy (a genre I don't dig). His stories are pretty good but sometimes I find them a little too straightforward and going "safe routes" and not taking risky turns.
So I don't really know who I'd choose between the two. It's a hard one for me. But I think I'll go with Izekeal.