Hi Jim,
I have both the powerflite perfect heat & the jag!
Both are fantastic machines fact! Jag has better suction than powerflite and has massive pump but in fairness mine has never gone above 300psi. Powerflite also has huge pump so much of the same. Jag has autofill and auto empty, both of which I personally don't use because I get my water from tap HOT. That's the beauty of the Powrflite savage hot water all the time, cannot be beaten on heat fact!
Love both machines and whatever you decide you can't go wrong.
Don't know much about storm havent checked the spec, prob great machine too.
Price could be big factor. Both suppliers very good too.
Bren