I'm sure if you search both products on these forums you will find much more info than I can give you, however I have had good success with controlling HH with probanthine.
They MUST be taken on an empty stomach otherwise you will have no effect & they take about 30mins to an hour to kick in. Also I suffer with side effects such as very dry mouth/eyes. However it does stop me sweating COMPLETELY. I am happy to live with the side effects and be sweat free if im honest.
I found a guy on here who crushes up the pills and snorts them. This enables it to work within 5-10 mins, and even if you have a full stomach. I can't say that I recommend it as it cant be good to put anything up your nose, but it does work perfectly, and I find I need a much lower dosage to get the desired effects of the drug.
Again I dont think thats a good way to take it long term but if you were in an emergency then I guess its good to know...