HTC Windows Phone 8X
Display is a big differentiator between the two devices. The 8X features a 4.3-inch 720p Super LCD 2 display, while the 8S uses a smaller 4-inch 800x480 display.
Storage is split between the two as well, with the 8X featuring 16GB of NAND on-board (no microSD card slot), and the 8S with only 4GB integrated and a microSD card slot for expansion.
HTC really ramped up its focus on the camera with the 8X. Aided by HTC's external imaging processor there's an 8MP f/2.0 rear facing camera with a 28mm lens. The front facing camera sounds pretty impressive at 2.1MP with a f/2.0 aperture and an 88-degree, ultra-wide-angle lens. The 8S features a 5MP f/2.8 camera by comparison.
Audio is also a priority for the 8X, which gets a 2.55V amplified headphone output for what promises to be a much better implementation of Beats. The 8X also features two microphones for noise cancelling duty.
The 8X features dual-band WiFi while the 8S continues its cost-reduced theme by only supporting 2.4GHz.
Colors are big in HTC's Windows Phone 8 line. The 8X is available in california blue, graphite black, flame red and limelight yellow. The 8S will come in domino, fiesta red, atlantic blue and high-rise gray. Both the Windows Phone 8X and 8S will be available starting in the beginning of November. HTC will be bringing the devices to over 150 carriers in 50+ countries. In the US we'll see these devices on AT&T, Verizon and T-Mobile. Customers in Europe will find the new HTC Windows Phone 8 lineup on Orange, O2 Telefonica, MTS, Three UK, T-Mobile and Vodafone. In Asia-Pacific markets you'll see the 8X/8S on Chunghwa Telecom, Optus, Singtel Group, Smartone, Telstra and Vodafone Australia.