Nokia quietly unveiled the Lumia 928 for Verizon Wireless last week, but one-upped itself this morning when it took the wraps off of its Lumia 925 at an event in London. Which phone is better? Well, that largely depends on you. What do you prefer: Aluminum or plastic?

It's been over half a year since we first tested the Lumia 920, Nokia's previous Windows Phone 8 flagship device. Not much has changed in the Windows Phone space since then, and the 925 and 928 are largely incremental upgrades. By and large, the hardware and specs are nearly the same across all three phones. What has changed is the design. The 925 and the 928 are smaller and lighter than the bloated 920, and the 925 is the first Lumia to feature an aluminum body.

But before we get to the changes, here's what stayed the same. The 925 and the 928 (and the 920, for that matter) are all powered by a 1.5-GHz dual-core Qualcomm Snapdragon S4 Plus MSM8960 processor. Each phone features a 4.5-inch screen (the 925 and the 928 are OLED, compared with the LCD on the 920) with the same 1,280-by-768-pixel resolution and the same 334 pixels per inch. Each phone has a 2,000mAh battery, support for wireless charging, Bluetooth 3.0, as well as GPS and NFC support. For the most part, these are all nearly the same exact phones.

So here's what's different. The Lumia 920 weighs in at a whopping 6.53 ounces, which makes it one of the heaviest phones in recent memory. The Lumia 928 weighs 5.71 ounces—still heavy, but an improvement. Gone is the matte finish of the 920 in favor of a high gloss. The Lumia 925, meanwhile, weighs in at 4.9 ounces, which makes it the most pocketable of the bunch. It also trades in the plastic for a metal back.

Unfortunately, Nokia's new Lumias eschew the fun color schemes introduced with the 920 in favor of much more drab, common colors. The 928 is available in black and white, while the 925 adds gray.

There are some differences among the cameras as well. Lead analyst Sascha Segan had some trouble with low-light performance on the Lumia 920. The new Lumias are using the same 8.7-megapixel sensor, but Nokia is promising better low-light performance with the addition of a Xenon flash to the 928 and an additional lens piece in the 925.

Three phones. Three carriers. Which one is worth your money? If you're already tied to a carrier, that's probably sufficient reason to influence your decision. None of these phones are different enough to warrant jumping ship, unless you absolutely can't pick up anything heavier than 4.9 ounces.

I haven't gotten my hands on the 925, but I'm testing the 928 as I write this. We'll have a review of that phone shortly. The Lumia 928 will be available from Verizon on Thursday, May 16 for $99.99. The Lumia 925 will be available from T-Mobile for an unspecified price at some point this summer.