I honestly have to go with Shane McMahon. Let me explain.
Jeff Hardy is a definite spot monkey. He's taken some of the most well known bumps in WWFE history. And yet, despite that, Jeff Hardy has some actual wrestling ability behind the gigantic bumps he's taken. Its not terrific by any means, but it exists.
Shane McMahon, on the other hand...
Shane has no wrestling ability. And yet his booking in the past to take some of the craziest bumps of all time...I don't really understand the point of it. John Pollock of Review a Wai and the Fight Network brought up this point and I think there's a lot of credibility to it. Shane going through the glass all those times at King of the Ring 2001, or taking dives off the Titantron at Summerslam 2000 and Backlash 2001, those types of spots are legitimately dangerous. Yet what's the point of getting Shane over? Is Shane going on the road? Is he gonna be a top merchandise seller? Is he gonna be the focal point of major company feuds? No. Shane isn't a trained wrestler. He's not gonna do any of these things. So why do you need to give him physical credibility by making him do all of these stunts? Why couldn't you have, say, other up and coming stars, or some of the talent being brought in from other organizations, do them? That would have really helped them. As John Pollock said, at KOTR 2001, why couldn't you have had DDP come in, since they were just about to do the Invasion, and have him go 20 minutes with Kurt Angle? Think about what that would have done for DDP in terms of solidifying him as a big deal, instead of having him run from Taker all the time. Instead, they gave the glass spots and match with Kurt to Shane, and nothing really ever came of it because Shane isn't a wrestler. What substance does he have besides the spots they gave them and his hardcore brawls? His stupid looking punches? They gave Shane just about every shortcut in the book to get over, like booking him to be 50/50 with an Olympic gold medalist, and ultimately there was no point. He was literally brought in to do these giant, dangerous looking spots. That, to me, is the ultimate spot monkey.