Cool name.
I think both sides are a good starting point, but imho clash somehow and do not particularly go well together. They do not share the same aesthetic/style and do not tell the same story in my opinion. It is subjective, and both could end with something good, but I would pick one style, and then work on differences between sides.
As
@NotRealNameNoSir said, I would ditch the text on the edge. Looks like a promo, adds nothing to the distinction between chips, and just adds visual clutter.
The stripes as background for the text is a problem.
I think I prefer the second side, I feel it has something classic, and a little more in tune with what Roaming Buffalo" evokes for me. I quite like the overall look, I think the solid colours and the rings work well.
The first has a somewhat busy/speedy/aggressive vibe, but to each their own.
Nitpicking, but I would perhaps make the buffalo a bit bigger. I feel the moon/sun/cactus are taking the focus, and the space above is a bit much. The left cactus needs to be smaller and let the text breath.
Not sure about the text denom. I think it works quite well, but on the other side, I think you have the perfect space in the dark ground to put a nice number.
Good luck