US Nats usually offers a tour of a local museum or military installation ('87 DC had a tour of Aberdeen, '17 Omaha had the SAC Museum) and is very contest centered. Telford is very SIG & club centered with the contest almost an afterthought. Telford is way more international(the 'I' in IPMS) due to all the European countries within a days drive. Both have their plusses and minuses about time of year, size of venue, changing locations, etc. Both have lots & lots of vendors. I like both and don't mind the travel to either from the West coast.