Roll on a US server if you:
- Want to play at non-peak times where the cities feel fairly empty and is harder to get groups for alerts
- Dont want to do raids
- You want to do raids at ~1am through till 3am
- Plan on doing most stuff solo unless youre prepared to stay up very late
That's why I am on the US server. Especially at weekends. I prefer to raid well into the early hours of the morning. On a weeknight I can be up until as late as 4am depending on my work shift.
Besides the US servers peak time is around 1am UK time. Perfect for me