Price
The Shard is the clear winner in this category. Currently on Amazon the Shard sells for $5.95, while the Brewzer is listed at $9.72.
Bottle Opener
Both the Brewzer and the Shard can function as bottle openers, though neither of them is as effective as a standard keychain bottle opener. I've had times using both tools where it took multiple attempts to pop a bottle cap off.
Pocket Carry
Both tools are small enough to carry in your pocket or on your keychain. The Brewzer gets the edge here, however, due to the Shard's cross driver point. That point, which can also function as a box cutter or package opener, is sharp. Sticking your hand in your pocket can often result in a poke and a few drops of blood when you're carrying the Shard on a keychain or loop.
Screwdrivers
The Brewzer has a wide, straight front edge that can very easily be used as a slotted screwdriver. The Shard, on the other hand, has a forked front edge for its pry bar, that can also double as small- and medium-sized slotted drivers. The different-sized drivers of the Shard are nice, but they have limited use because of their proximity to each other. You won't be able to use them on many recessed screws, or screws very close to a wall or other protrusion, because the driver you're not using will get in the way.However, the Shard does also include a rudimentary cross driver on its other end. This driver can turn Phillips screws, and does a fairly good job of it. The Shard wins by a little bit in this category.
Box Cutter
As a box cutter, cardboard cutter, or package opener, both of these tools are about equal, with the Brewzer being just the tiniest bit better. The Shard's pointed cross driver makes the initial cut into cardboard much easier, but the Brewzer's slightly-hooked tip gives it better follow-through.Pry Bar
The Brewzer's pry bar is much less pronounced than the Shard's. The Brewzer's shape and design give it a decent grip when using the pry bar, which would be useful for small things. However, the Shard's pry bar is much larger, is angled to allow for more leverage, and is also forked, so it can be used to remove nails (like the claw end of a hammer). The Shard's pry bar easily beats out the Brewzer's pry bar.
Size
The two tools are very similar in size. Amazon lists the Shard at 0.3 ounces, with dimensions of 3.1" x 1.3" x 0.6". It lists the Brewzer as 0.5 ounces, with dimensions of 2" x 1.2" x 3". However, when you hold the two tools, the Shard feels heavier. The Shard has a larger footprint than the Brewzer, being both longer and wider, as well as more three-dimensional (because of the pry bar). If you're looking for a more compact, lightweight pocket tool, the Brewzer wins that fight.
Usefulness
Both tools can be used as a bottle opener, slotted screwdriver, and pry bar. The Brewzer has a couple of cut-outs that can be used as box or open wrenches to turn small nuts or bolts. The Shard has a cross driver. Both tools offer about the same amount of functionality, with the main differences being determined by what you need them to do.
Overall
Which tool is better than the other is very subjective, and depends heavily on what your main uses will be. Overall, the edge goes to the Shard. It's significantly cheaper than the Brewzer and offers more everyday usefulness, because of the presence of a cross/Phillips driver as well as the increased leverage you can get out of its pry bar.
