I'd lead a club. Partner is probably doubling on an AK somewhere, two aces, or a KQ and an Ace. I dont need to lead hearts in any of these cases, and I probably dont need to lead diamonds either. Without the double I'd probably have to decide whether the auction + my heart holding merited trying to find partner with the sK and a stick, but now I think I have a clear club lead since that is where pard could have a KQ