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https://static5.comicvine.com/uploads/original/0/4378/5239604-jay-garrick.jpg

vs

http://img.vinereport.com/full/8055/570-386/the-flash.jpg

Fight takes place Central City.

Who wins?

I want to say Thawne. He's just more ruthless and won't hesitate to use deadly force.

On the other hand Jay did come along later in the series when Flash was more powerful, and seemed to be shown as at least a peer in power to Barry I think.