HcGenerate is a good stand alone. Which is good, since it would be quite expensive to stack with something else.
Phytoserms - I haven't tried it so probably would get flamed for criticizing the price, (but its way expensive
).
Stacking HcGenerate and phytoserms would be really really high priced and I can't imagine that the results would be worth the high price compared to other options. Plus, they contains some of the same ingredients (like Fadogia).
Ultra Male RX, and Testalensis, are bulbine containing products like phytoserms, but much more affordable, if you want to try one of those in a stack (with Unleashed maybe).
I've had good luck with Unleashed alone, and stacked with DAA. Either way, affordable and effective.
I wouldn't put RS Transaderm in the same group as these other options, since it is suppressive.
So, I'd go with Hcgenerate alone, or the Unleashed- DAA stack. Both good options and no need to spend more. Se how they work for you and go from there.