The S6 edge+ is essentially a larger version of the original edge that we saw earlier this year, measuring 8 percent taller and wider. The larger handset is the thinner of the two, but only by a hair.
That extra size gives the edge+ a little extra heft, weighing 16 percent more than the smaller handset.
Both smartphones features the same aluminum frame design.
You'll also find Gorilla Glass 4 on the backs of both devices.
There's a choice of colors with both smartphones, though most wireless carriers are currently only offering pre-orders of the black and gold edge+ variants.
The defining difference between these two handsets comes in display size, with the edge+ offering 25 percent more screen real estate than the edge.
The edge+ might offer a larger display, but you'll find the same resolution on both handsets. While that does equates to 11 percent more pixels per inch on the S6 edge, both panels are extremely sharp.
Both devices make use of AMOLED display tech.
As their names suggest, both devices' screens curve down at the edges.
The edge+ might fall into phablet territory, but don't expect to find a stylus included, as you would with the Note line.
Both the edge and its big brother are powered by top-tier Exynos processors.
The S6 edge+ bests the smaller handset when it comes to memory, offering an impressive 4 GB of RAM.
Of the two, only the smaller edge smartphone is offered in the highest capacity 128 GB variant.
It might be worth picking one of the larger capacity storage options, as you won't find a card reader anywhere here.
You'll find the same megapixel count on both devices' cameras.
Both smartphones pack high-end f/1.9 apertures on their rear cameras.
There's Optical Image Stabilization included on both smartphone's rear shooters.
Given that the S6 edge+ is a larger handset, it's no surprise that there's a larger battery installed.
As with the majority of 2015 flagship smartphones, there's no getting at batteries here.
As along as you're using the included cable, you'll be able to quickly charge up either handset when they're nearly out of power.
There's wireless charging on board with both devices.
The edge+ goes one better here, though, offering fast wireless charging, which according to Samsung, will take the battery from dead to full in just two hours.
Either handset will work with Samsung's glossy new payment service, set to launch next month.
There's a fingerprint sensor included on the physical button on the front of both devices. Unlike older Samsung handsets, you only have to touch a finger to these sensors, rather than swipe across them.
You'll be able to use Samsung's Blackberry-like keyboard cover with the newer smartphone.
Whichever device you opt for, you'll get the latest flavor of Android, augmented with Samsung's own UI skin, which is subtler, with less bloat, than in previous years.
The devices' launch dates are just four months apart.
Starting price (full retail)
When it comes to asking price, there isn't much of a difference here. The S6 edge+ does have some variation in asking price between carriers, and you're much more likely to find deals on the four-month-old handset, but the figure quoted here represents an average.