We went for a twin turbo, much faster and makes the car perform much better at motorway speeds, these feel like absolute freight trains sometimes. I have read that the single turbo engine feels slightly more strain due to dealing with the cars weight through one turbo only, which can lead to accelerated wear. It generally isn't an issue, but with two turbos the share of boost amongst them means that they wear less easily.

That being said, that rarely is the case, you only hear bad things on the internet. Realistically, the MPG difference is marginal, you will only be seeing 23-25mpg average anyway, so why not have the extra turbo?