Artisan Bespoke 002 or 004

After some consideration of the info on your website we have maybe decided on the Artisan Bespoke 002 or 004 kingsize. I assume the 'medium feel' tag is in respect to the 'top layers' of the mattress? Our weights are 12 stone and 9 stone so we would also choose medium tension. Not sure which one to choose the 002 or the 004, any advice would be greatly appreciated.