1963 for leisure, 2023 for commuting. For instance, if I were to leave Northampton at 07:00, I'd get there around 10:00 in 1963 (or at least, I think. I'll have to consult my 1963 timetable), whereas today to get to London at 10:00 I'd need to leave at around half eight. aside from the times, I'd probably have to pick 1963, sue to the fact that there was a non-electrified WCML, and lots of locomotives. however 2023 has more trains per day, and the 350s are on the whole very nice units. With the stations, they would mostly be under refurbishment.