944 turbo, hands down. I've driven both the 951 and the 635 when they were new and while the Beemer is a classic shape, the driving experience is a big yawn compared to a newish 944 turbo.
The question was if they were all in good shape and cost the same. That would make either the 944 extremely cheap or the 635 extremely expensive. In the real world, you can buy 3 good 635s for the price of a good 951.
Maybe if it was a Euro M6 w manual trans it would be a fair question.
