I disagree I think head to head the AT-AT would have the advantage. It's from the OT which means that it appeals to not only the younger Star Wars crowd but I believe it would do far better with "classic" collectors. The AT-AT is recognizably Star Wars, the Turbo Tank is far less so.
However, after seeing the images that popped up yesterday of the Nikto guard from Jabba's Sailbarge, I really can't help but wonder what's going on there. I know it's just a prototype, but why show the figure holding that canon that mounts on the rail of the sailbarge? I don't assume that Hasbro would let the prototype image go if it included something they didn't intend to release with the actual figure and yet look at the base of the weapon, it's a half circle. There's not tripod for it it just hangs there... asking, begging, pleading for a sailbarge to clip to. Maybe it's just me but I remember us asking Hasbro point blank about the BMF and they kept telling us it wasn't coming or it wasn't coming this year and then the photos leaked and they had to fess up. Is it possible that everytime we ask about the sailbarge and they say no it's for this exact same reason?