A well sorted Merc S (or MK3 Mercury) would be my personal choice over a 35E any day as IMHO they are a nicer looking, better handling gun. The HW has a better trigger, but these later BSA's with the adjustable jaws can be fettled to have a very usable trigger, can be made to go very well, and good ones are just as accurate as the HW.
ATB, Ed