Cooper S v JCW Cooper S

Looking to get back in a Mini and considering a few options, I have read up on the so called experts what you can get power to fuel consumption but I wanna know reality...............whats it actually like driving a Cooper S (Ive had one before) compared to a JCW Cooper S, apart from the expected more fun in the JCW?
IS there that much of a diff?
Consumption isnt really a financial worry, more just looking for the info out of interest


Thanks

A JCW is quicker but in day to day life it’s not a massive jump, the brakes make a huge difference. But I wouldn’t be put off a Cooper S if it had the right spec which seems to be a big thing for you