I've used both of this kryptonite lock and this OnGuard lock. I will switch between them depending on the bike I'm riding and it's also nice to have the second lock either to lend to a friend or keep that second moped locked up while out.

The Kryptonite lock's chains are a hair thicker but at just 39 inches it's a bit small and makes locking up to anything meaningful a challenge at times. Not to say it isn't do able but at a crowded bike rack it can feel a bit short. For my Motobecane or Peugeot for example it works well and I'll try to get around the frame and the back tire if I can (in addition to the pole). As for carrying it, you certainly don't forget that it's in your bag and personally I've noticed it's a bit more comfortable wearing it as a bandolier, albeit a shorter one.

As for the OnGuard lock, the chains a millimeter thinner but still have the hex shape to them and will provide about the same amount of an obstacle for anyone thinking about stealing your bike. What makes this lock so great though is that it's a noose style lock. Which means that on one side of the chain there is a larger loop you slide the other side through and can pull tight. This lets you wrap around your pole and then pull out the slack giving you more chain to work with. The end of this lock is a T bar sort of thing, (look at the picture in the link and you'll see what I mean) it will probably be the point that makes or breaks this lock for people looking to lock up your moped. What you can do is you take the lock off and slide it through the back wheel, triple tree or anywhere else that it can't be pulled back through. Of course if you can't find a place on your bike to do that you could always just keep it a loop like the other lock.

For myself when it comes to my pinto I like to wrap it around the post and slide the T side through one of the holes in the frame, it's a perfect fit. Which means I can get myself locked up to a really crowded bike rack or a pole that I can't be up right up against. Still yet if I'm out with several friends and they don't have locks I can slip the noose side around their bikes and then slip the lock back through that hole in my frame.

Oh and I also wear this bandolier style but it's a bit bigger and fits more comfortably. Granted I'm not a big guy at 5'9" and 130 pounds but there is plenty of room left in it for a bigger guy to wear comfortably.

Furthermore on the OnGuard lock it's sort of spring loaded and once the key has been turned it'll pop the lock right off and won't let you take the key out until it's firmly in place. This is opposed to the Kryptonite lock where I find occasionally the discs will get jumbled and will require you to wiggle the key back and forth to get all of them lined up so you can get it opened or closed.

If I had to go out again and purchase a lock again I'd consider getting either a much longer kryptonite lock and ideally this one which is a noose style and 51 inches or the OnGuard lock. Really though if you happened to have a Pinto, Freespirit, Magnum or anything else that happens to have holes in the frame I'd point you to the OnGuard.