LG Expo (AT&T)

Pros: Compared to HTC HD2, LG expo/LG Telus(same phone) beats it by a physical keyboard.
Fingerprint reader
Retina display just like iPhone 4(not a hoax)
Snapdragon processor
Windows Mobile OS

Cons: Bluetooth 3.0
no extra-capacity batteries yet
few physical buttons
no compass
no 3.5mm audio jack
no high-def video recording(720p)
low GSM antenna gain
low microphone volume gain

Summary: Compared to HTC HD2, LG expo/LG Telus(same phone) beats it by a physical keyboard.
Pros:
Fingerprint reader
Retina display just like iPhone 4(not a hoax)
Snapdragon processor
Windows Mobile OS
Windows Mobile 6.5
With WM, you can customise your own neat-arrange homescreen, unlike android and iOS
Has own LG expo community called LG-expo.com
Keyboard
A second official ROM has been released by LG(Amazing right?)
5.0MP camera
Internet explorer in WM6.5 is better than you think
Resistive screen, but is capacitive too(GUI is in fact stylus free)
Very cheap, because the WM market is deteriorating

The processor speed greatly enhance windows mobile OS(WM), which WM needs very high speed like this to actually work well. WM is a great old(experienced) OS, boasting loads of mature and free or crackable apps. Sometimes you just don't like Android and IOS. WM6.5 in this phone has greatly enhanced the GUI experience, I never knew WM6.5 is nice to use until I bought this phone. Certainly, join XDA developers to download Custom ROM and enhancement tweaks for LG expo is a wise move, but not recommended legally. Flashing new ROM is fast and one-step, I love it. It has got retina display, pixels as small as iphone 4's, don't be fooled by apple's "retina only in iphone 4" claim, now business users could have it in LG expo way earlier than iphone 4. Fingerprint reader is a must, it eliminates the hassle to type passwords by just a simple swype. Keyboard buttons are broad and ok. Internet explorer browser is amazingly powerful, just like what you can find in android. I personally believe that resistive screen is always better than capacitive screen as you can do delicate things on resistive but only bulky stunted actions on capacitive, with the aid of stylus sometimes. Thank goodness that LG expo is still having a resistive screen. You can also say WM has an older history of having folder function, multitasking ability which are far well working than android and iOS. I love WM's PC like file explorer as well.

Cons:
Bluetooth 3.0
no extra-capacity batteries yet
few physical buttons
no compass
no 3.5mm audio jack
no high-def video recording(720p)
low GSM antenna gain
low microphone volume gain

Bluetooth 3.0 is many times faster than Bluetooth 2.1 in Lg expo. Compass is hugely needed in navigation. Surprisingly, it has lower antenna gain shown in the display, but... but..., it has proven to me that it has no problem like other phone when calling in the basement. However, low microphone gain is somehow a problem here. When holding the phone you need to curve your palm to reflect sound back to the bottom of the phone and that helps.