I have several Isobutane powered gadgets made by MSR, Primus, Snow Peak and Brunton. All of the them have a standard cartridge interface (I think it's called a Lindar valve).

I've probably used all of the available gas cartridges in all of the devices at one time or another. In my opinion there isn't any real difference between any of them wrt performance. You might notice that each vendor says to only use their fuel on their appliances, but each vendor is also clear to say that you can use their fuel canisters on anybody's appliance.....get it?

btw, coleman also makes a Lindar valved butane cartridge for their exponent line--the powermax is butane, but different style.