This is a match-up I've been thinking about for quite some time. It's about as 'fair' and equal a match-up as can be had, given the very different form factors on the two tools.

Before I get into any detail, I wanted to say that this is maybe not so scientific as some of my previous tests. This is more a comparison of the tools from MY perspective... how they work for ME. YMMV.
Let's start with a run-down of the implements that the tools share, and what are unique to each.
Shared:
Main Blade
Can Opener
Bottle Opener
Scissors
Needle Nose Plier
Regular Plier
Phillips Driver
Large Flathead
Medium Flathead
Lanyard Ring
What's only on the Deluxe Tinker:
Small Blade
Awl
Toothpick
Tweezer
Wire Stripper
Wire Crimper
Parcel Hook
What's only on the Juice S2:
Wire Cutter
Hard Wire Cutter
Small Flathead
Both are 125g (4.4oz) in weight. This is largely why I find them so comparable. They are pushing toward the edge of what most folks find comfortable for pocket carry.
I purchased both at Grand Prairie Knives. The Juice was $42.50, The Deluxe Tinker was $38.95.
So, a tool-by-tool comparison. And again, keep in mind, this is just MY opinion.
Main Blade: While the Leatherman blade is very slightly more useful for thrusting (for instance, puncturing a package), the DT's blade is more useful on a day to day basis. This comes in most noticeably if the blade is forced into cutting food. Point to DT.
Can Opener: The blunt edge of the Juice's can opener makes initial puncture of a can tough. The Tinker's can opener wins this hands down. Outside of use specifically as a can opener, the Tinker still wins for various scratching and very light pry tasks. Point to DT.
Bottle Opener: Not much to say here. Both will lift a cap, although the Tinker is very slightly more likely to do it on the first pull. Too close to call, IMO.
Scissors: I prefer the 'wenger' spring system of the Leatherman tool, but the extra step to access (opening can opener first), and worse precision of the hinge, making them less useful for lefties, means I have to give this to the Deluxe Tinker.
Needle Nose Plier: As 'super tweezers', they are about equal. The shape of these two tools is so different that each will excel at certain tasks over the other. The Leatherman pulls ahead quickly with more substantial jobs. Point to Juice.
Regular Plier: The Juice wins this both in the range of size of bolt that could be manipulated AND the amount of force that could be applied. Point to Juice.
Phillips Driver: This is the first time in this review where I feel I might take some heat. Due to the position on the tool, I find the Juice's Phillips driver to be more useful. Even adding in the medium flathead as secondary phillips on the Deluxe Tinker, I still give this one to the Juice.
Large Flathead: This is very close. The design of each tool is such that each will have somewhat better reach in different circumstances. Both are excellent, and good light-duty pry tools. Too close to call.
Medium Flathead: As a dedicated driver, the Juice has a better medium flathead. Competing against the rounded off driver at the end of the can opener on the Deluxe Tinker, the Leatherman's driver wins.
Lanyard Ring: The immobile lanyard ring/splitring of the Sak may on occasion get in the way of function. The lanyard attachment of the Juice allows it to either be swiveled out of the way, or stowed away altogether. Point to the Juice.
Additional tools on the Deluxe Tinker:
Small Blade: Excellent option to keep a second, super-sharp blade available. Big point here.
Awl: An amazing, if (for me) not often needed addition. Another huge bonus.
Toothpick: Used WAY more often than I would have imagined. Very useful.
Tweezers: Another option that's not used by me all that often. Useful on those rare occasions, though.
Wire Stripper and Wire Crimper: Honestly, I NEVER use these.
Parcel Hook: Another option I've never used, but I see some potential.
Additional tools on the Juice:
Wire Cutter/Hard Wire Cutter: While not the most robust cutters, they will do a surprising amount of work. For the size of the tool, the cutters are, IMO, great. Big point here.
Small Flathead: This is perfect, if you need to adjust gun sights. Outside of that, it also works as a half decent awl. Okay addition.
Finish: The scales of the Juice are subject to scratching, removing the color from the tool. The scales on the Deluxe Tinker can be chipped and scratch pretty easily, but can also be replaced. I'm giving this one to the Deluxe Tinker.
So, added all up, in my opinion, who wins this? The entire conversation comes down to how much plier capability you need. Not much? I'd pick the Deluxe Tinker. Need more? Then the Juice wins. The Deluxe Tinker gives you more options, but some of those aren't as stout as the Juice's.
So, the winner is... ME! I have both now!
