User blog:Baldwin17/US dub vs UK original

It seems I came across something that I thought I'd never have to deal with, and that is when making crossovers involving characters dubbed in American English when they originally speak in UK English.

I know it's a minor and trivial matter, but I would like to know if you, the viewing public, would prefer the dubbed or original voices when watching a crossover that involves British characters like Ben and Holly or Thomas or Bob the Builder.

Which should I choose?