The Moto Z is 3 percent taller and a hair wider than the LG G5.
The most striking number here is the Moto Z's thickness: at a ridiculous 5.2 mm, it's 32 percent thinner than the G5. That doesn't include any Moto mods attached though (we'll explain that in a second), so you only get that svelte measurement if you use the phone "naked."
That crazy-thin Moto Z is also crazy-light, coming in at 15 percent lighter than the G5.
The same asterisk applies here, though, as any mods you snap onto the Moto will add to its weight.
Motorola describes the Z as being made of aluminum and stainless steel. The G5, like most of today's flagships, sticks with only the former.
As you know both phones let you customize (and re-customize) to your taste by adding on or swapping out parts.
The two approaches, however, are radically different. The Moto Z has the simpler and more elegant angle, as you just snap a "Mod" onto its backside (strong magnets snap and hold it in place) to add a new look or function. On the G5, you have to yank off the phone's entire bottom section ("chin"), which pulls the battery out with it.
Modular swap w/o powering down
This is an odd category, but we think it's worth throwing in to illustrate a key byproduct of the two different approaches. On the Moto Z, you can snap on a new mod without skipping a beat. On the G5, though, you have to power down the phone every time to swap out (since the battery comes out with each one).
Advantage, Moto Z.
There are actually more than these four color options for the Moto Z, since some of its mods ("Style Shells") add a completely different color or material.
The Moto Z gives you an 8 percent bigger display.
With a slightly smaller screen and the same resolution, the G5's pixel density comes out 4 percent sharper.
Similar to Samsung vs. iPhone display panels, we have AMOLED vs. IPS here.
Similar to the Galaxy S7, both the Moto Z and LG G5 can flash pertinent info like time and date on an otherwise black screen.
As with just about every flagship today, both of these have fingerprint sensors – though the G5's is on its back, while the Moto Z's is on its front. The Moto's doesn't double as a home button, though, like iPhones and Galaxies; instead it's also a sleep/wake/power button.
LG's optional B&O Play module adds an amplifier and 32-bit DAC to the G5, making it one of the best phones for audiophiles. The only catch is that this module, oddly, isn't yet available in the US – with no confirmation it ever will be.
It's hard to get too excited about LG's modular flagship when there's only one modular accessory (Cam Plus, more on that in a minute) available in the US.
This is one of the more niche mods for the Moto Z: a thick and beefy add-on will let the phone project its screen as a 70-inch image on a nearby wall.
Another Moto Z mod turns the phone into a powerful little boom box, including a kickstand to prop it up.
In terms of internal storage, LG stuck with just the one 32 GB tier.
Fortunately both phones have expandable microSD slots.
In both cases, you're looking at a super-fast Snapdragon 820 chip.
RAM is also even at a nice 4 GB.
The G5 has the advantage in camera resolution, but that doesn't necessarily mean it will take better shots.
Camera aperture (rear)
Aperture is also equally wide, suggesting they may have similar low-lit capabilities (though this too is determined by other factors).
The G5 has an 8 percent bigger battery inside, but both give you options. One of the Moto Z's mods (Incipio OffGrid) is essentially a built-in battery case, which adds an extra 2,220 mAh to its total.
LG's Cam Plus module (which adds a better grip for photography, along with physical camera buttons) gives it an extra 1,200 mAh.
Like Android phones of old, one of the LG G5's tricks is that you can swap out its battery for an identical one. Stagger a few of these together and the phone can keep chugging along for days.
Like all modern Android flagships, both support quick charge tech – so you can juice it up much faster than an iPhone would.
Neither phone has built-in wireless charging, but one of the two Incipio OffGrid battery mods for the Moto Z adds this funtionality.
The Moto Z's software is very close to stock Android (Motorola's customizations tend to be more about useful new features than changing Google's core look or feel), while the G5 uses a (less pleasing, in our opinion) custom UI.
The G5 has been around for a few months, while the Moto Z will first appear on Verizon sometime within the next couple of months. It sounds like that timed exclusivity ends in September, when the phone ships to other carriers, along with an unlocked global model.
Starting price (full retail)
We still don't know what the Moto Z, or its mods, will cost. Since the prices of add-ons can add up, it would be nice to see Motorola go aggressive here, with something in the US$450-550 range for the base phone. We'll see.
Correction: The article originally stated that the Moto Z didn't have an always-on display option, but the company has told us that it indeed will.