I have owned a Tembo, Big 5, Halfbreed, and a Cheetah. I don’t own a chronograph, so I don’t have any objective evidence on performance. Subjectively speaking, I couldn’t feel any difference among them. They were all good bows.
In theory, the Tembo may be a better performer because it only has three lams, opposed to the Cheetah’s four lams. Fewer lams means less glue, which in turn means lighter limbs. So, again, in theory, the limbs may recover faster. This is why some say they like the 3-lam Tembo over others with more lams.
Another thing to consider is that true Hill-style handles have steep and narrow sweeps. As a result, a lot of stress is placed on the fadeout. Having a bow with one one lam running up belly side of the riser (like the Cheetah), may theoretically not be as structurally sound as a bow where all the lams are stacked behind the riser. You can, however, ask Craig to build any model will all lams stacked behind the riser if you want.
Finally, when dealing with clear glass, you always run the risk of getting a bow with streaky glass. Not that it matters performance wise, but some people may find that unappealing.
Ultimately, it all comes down to personal preference. Life’s short. Why not buy both and see which one you like best? Fortunately, the re-sale market for Hills right now is great, so you won’t be out much if you decide to sell one.