As a deodorant I find the Pitrok alum stick is about the best in terms of keeping its shape - other alum sticks I've used quickly become loose in their containers. Personally, I don't like the sound of anti-perspirants as they seem unnatural. Using alum seems to be all I need although I'm not claiming it has any effect on perspiration.
I have a couple of sticks but first of all I usually use pit rok it's about £6 ish at boots and lasts years...it's just an alum really but it works great ! I'm also using TOBS Jermyn Street and Geo F Trumpers Limes !
I use a crystal deodorant stick after my showers just to keep things clean down there. But my go to stick is from MenScience, it's pretty expensive but it works and the stick lasts forever. I still have 1/4 of my first stick left and 2 backup sticks. The deodorant is odor less and it doesn't leave stains on shirt pits so if you have expensive dress shirts this is a stick to use.
I also have really sensitive under arms and this has been one of the few products that work for me.