Since the OP Title asks which one, I'd stick w/the Snowpeak. In my mind, that IS the "upgrade."
I have a Reactor; wicked, wicked fast boil. It's heavy, though. I've been using it to make coffee those mornings I'm late leaving the house; my water's boiling before I can get the beans ground. Not sure you'll find the stove in my pack very often, though... like the Jetboil, double the weight of a light canister stove and pot. Time will tell.
If you didn't try a Caldera on your alcohol stove path, I'd recommend trying one before you give up on alky.