At the outset congratulations for getting through what I believe is certainly one of the best MBA programs in Europe.
Regarding your concern on what-if I think the issue is not with SBS v/s Whatchamacallit alone but with US v/s UK, and 2 years v/s 1 year.
1. Cost of education (including lost opportunity cost) is lower in Said than anyother US Bschool.
2. Brand of Oxford trumps almost everyother University name in the world (except Harvard maybe
3. Work VISA in the UK is a lot more easier than the H1 route in the US - especially over the last few years.
1. US Economy/available jobs >>> UK economy/available jobs
2. Perceived/known quality of education in say a Ross or a Fuqua is more than that of Said. Maybe it is because the US schools are better are branding it but it is atleast "perceptibly" better.
3. 1 year maybe a rush if you are looking at switching careers. 2 years allows you the luxury to do an internship, and in many ways the only shot at career change.
So I don't think its school X versus school Y but something that is more basic.
Hope this analysis helps,