On Being Human BBC
I was a faithful fan of the BBC version and had watched 3 seasons (3 series in BBC vernacular) before I watched the first syfy episode.
Overall I preferred the BBC version until they totally revamped the cast. The new cast and the 4th season has not grabbed me yet. It will be back on BBC for a 5th this month and I will see how it goes.
Meanwhile, I watch the syfy version and it's not bad but I don't consider it to be all that. Especially the way the new season has progressed so far.