US
pro: later shop hours, breakfast places, sunshine, the beach, SERVICE, apple pancake from Walker Brothers in Wilmette, cheap petrol, cheap consumer goods, NHL, target, cheaper MINI Coopers, music radio, smiles, on average much cleaner people, dry weather, kinkos, cheap dry cleaners, Panera, Chicago pizza, Vienna beef (a Chicago thing), Bears, less rain
con: higher crime, no NHS(it really works and pay more in US to wait just as long to see a doc.), high cost prescriptions, weak currency, stop signs, slow traffic and heavy snow that last for months
UK
pro: history, less regulation, more grocery choice/better quality produce, easy pace of life.....at least in the Cotswolds, the village pub, exceptional weekend trips, strong currency, traditions, rugby, Royal Ascot, London, the village store, countryside, access to vintage goods, political system that seems to be more connected to the local community, BBC news and crumpets.
con: rain, clouds, cheap kabab places, high petrol prices, motorbikes that cut you off, restuarants that have no service or table water, bad teeth, chavs, bus shelters with lots of baseball cap wearing chavs, moldy walls from months of rain, rude builders and grotty Slough