Neither, firstly they are too madly in love to fight. However just for the question I'll pretend they would.
If it was a play fight, they'd end up fucking before someone won.
If it was a real fight, too many people would jump in to stop it, this would result in a giant orgy, yet again before either of them won.
Speaking of
@Evil Surgeon
After I left earlier I realised another Slumling that you had forgotten, which was kind of ironic as I got this pic from a message you made on his profile
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Morning Slender

Fine I'll say it to your face.
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Ahh, my favourite travel guide book, I know it well.