I love the horse blanket type for ease, but they shift badly on both my dogs no matter the brand/style. I have Fido Fleece types for both dogs as well, but like to have something more water resistant for long periods outside in the snow.
Meg has a Zentek as well; I actually love it for the fit, and it does seem to keep her fairly warm given how lightweight it is. Crazy expensive though; I got talked into it at the vendors at Cynosport, just because I loved the look of them.