Which one you ask? UK or US?
All of it!
I do not understand the need of some fans to pick one or the other. Either/or, team thinking is so limiting.
Becoming Human was a treat (one I hope they further pursue). I even enjoyed the original pilot which was done sometime before the series with different actors.
Over the past few weeks, I have been re-watching both versions of Being Human courtesy of Netflix. This week, the US will start its second season on Syfy. Later this month the UK will be ramping up their 4th season with an almost entirely new cast.
To introduce the new vampire in the UK series, the BBC released this short prequel story. I think it is going to be a good season.