I have not noticed a rubber smell but as I pointed out I have replaced mine with aluminium to save weight.
I think your pocket rocket on full blast may well be quicker. I think the jetboil is optimized for fuel economy not all out speed. Mind you having it all in one system means that a lot of people could stop at lunch time and brew a hot cup or 2 quicker, from stopping to first sip, with a jetboil. It is very convenient.
Concerning the other stove remarks about stoves for long periods without resupply a bushbuddy type wood stove will win for fun and lightest overall weight in my opinion. I have not however found it easy to consistently find fuel in Scotland as I cant get it to burn heather and on high routes wood is not usually there. As a wimp who likes to cook in my tent when it rains, the bushbuddy has its problems.
Multifuel stoves I think are smelly and dangerous. I use mine when I dont expect to be able to get canisters, places like Morocco, but I dispute that they are lighter either alone or as a package with all fuel, than a Jetboil for extended trips without resupply.
I remember having to engineer my bicycle pump to pressurize my multifuel when the fuel pump stopped working in Morocco. I suppose that was more fun than a jetboil would have been.