I feel this thread has gone a tad off topic, so to get back to the original question..
In comparison to ruben lenten, hadlow's build quality i would say is fairly medioacre.
http://www.bufeo.net/fotos2007-III/Aaron-Hadlow_1.jpg
I mean, just look at that stacking, those abs.. mmm.
http://www.aloha.lv/upload/Lenten%20walk.jpg
I think in a direct comparison to Slingshot, flexifoils R&D budget this year should be put towards a new turbo gym, that and a different hair stylist.
As for which rides best, i wouldnt know. You'd have to ask somone with experience in the matter. Like wenglish.