I've only just started playing recently, and the people I've played against aren't exactly top tier, but from what I've seen, WR seemed like a generally better way to go. In the 5-6 games I've played, I've only been knocked out by an aggro deck once, and that was mostly due to poor playing on my part. Personally, I enjoy the bump in Aggro, because I think it's a more interactive way to play, but I can understand why people could like WR, too. My deck's a bit of a hybrid, so I can play either way as the situation requires, thus I've won both via aggroing and WRing, and I've always preferred the aggro method.
But that's just me.