The Rampages would make a better snow tire due to the bigger knobs. The Weirwolf LT is a high volume tire but not much bigger than the Rampage, and the knobs are very low profile. The WTB Stout is probably the biggest knobbiest and heaviest thing out there in a 29er right now.
I'll chime in and recommend the Stout as well. I don't know of a single tire that hooks up better than the Stout. Tho for mud, it is impossible to beat the Conti Mountain King, so that may be another good choice for snow as well. Fairly lightweight when compared to the stout, and similar volume. The WW does not have a lot of bite.
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