i can speak from what i know of axial AX10 and i know that is a good platform, Electrix Barrage, my LHS owner loves his, as far as the two you have posted Redcat/vaterra, i have no idea.
i know my LHS is getting the new Associated CR12 coming in soon, wanted to look at that when they did. looking at the redcat crawlers, they look really cool imo, i know its redcat, but still. G-Made makes really good crawlers as well. my buddy has the R1 Rock buggy with a novak goat crawler...