Haven't tried either of those. But the poblano corn chowder at Packit Gourmet is pretty darned good (as well as much of their food, my favorite place to shop for my backpacking meals).

While quite expensive, the Smoked Sockeye Salmon Chowder at Heather's Choice is pretty darned good as well (as is much of their selection, I've had most of it - it's just all so darned expensive comparatively).