I think that if you're asking which one is better if you were to only pick one, then that answer is going to vary by the person.
I personally take M-Test and Optimize-T both on a daily basis and am going to try adding Cloma-Plex to them and see how I like it.
M-Test is a great natural test booster and has long been a favorite of many people for boosting free and total testosterone levels and common feedback includes improved libido, positive mood, improved sense of well-being, better recovery, etc. Basically all the things that you would commonly associate with improved natural testosterone levels.
Optimize-T is a great natural test booster and was specifically formulated to be a great option to stack with M-Test or a great option for people that don't like some of the ingredients in M-Test (as great as KSM-66 and Mucuna are, some people don't respond as well to them as myself or others).
Cloma-Plex is probably not as strong of a natural test booster solo as Optimize-T for example but it has an estrogen control/estrogen modulating component thrown into it - so it will work better for someone with higher estrogen levels that need to be brought under control, but is also an ideal candidate to stack with one or both of the above.