I rate Warne slightly ahead, because I believe he is a more dangerous bowler on pitches which do not assist spin bowling. Similar to why I rate McGrath slightly ahead of Ambrose. Ambrose was the more destructive bowler on green tops, but at times was forced into simply being economical and unpenetrative on flat pitches (which is hardly a crime!), while McGrath seems to excel in the most difficult of conditions, and still show an ability to tear teams apart when conditions go in his favour. Parallel for me to Warne and Murali, and indeed the Lara and Tendulkar debate as well.
Both, obviously, all-time greats.
I know a place where a royal flush
Can never beat a pair