First off, the last thing you want to do is lower your DHT if you are after a libido boost. The opposite is what will give you that boost in libido/performance. Proper DHT levels are also beneficial for the CNS in maintaining muscle strength. Fenugreek/Testofen are outdated and for good reason. It seems to raise all androgens for a bit but quickly leads to a decrease in testosterone and an increase in estrogen. This is one of the ingredients responsible for Test boosters getting a bad reputation and people actually getting pre and post blood work showing that they actually have lower test after a natural test booster run. Saw Palmetto is also something to stay away from.
I would go with OL Test1fy. Great stuff! Blows away KB by a long shot in my experience..
Have not tried Alphamax or M-Test but I do love Fadogia! Then again, who doesn't.