To be honest I don't think there's much between them. Personally I'd go for a decent foxeye with low milage, the best you can find for your budget. Improved tank, light, fairing, hazard switch and mirrors. Most parts are interchangeable so plenty of spares about. I'm not biased, I've got a boxeye. To my mind the larger tank is the winning feature, everything else you can change/live with.
putting prejudice aside, ie; accoirding to what you ownwhich is best boxeye or foxeye? What would you buy?and what would you buy if you had just £1500, no morelove to know with reasons as relevant, like are they both as comfortable over long distance