The HD is a newer phone, and so it will continue with updates and support for probably at least a year beyond the Droid RAZR MAXX. The Droid RAZR MAXX is a great phone (I have one), and it is still being supported but will be reaching "end of life" soon as they've already announced "end of life" is coming for the Droid RAZR.
The Droid RAZR MAXX runs on dual-core TI OMAP-4430 processor clocked at 1.2GHz . The Droid RAZR MAXX HD increased the processor speed to a 1.5GHz with a dual-core Snapdragon S4 processor *(thanks 4low4fun for the update).
The Droid RAZR MAXX HD has a 4.7-inch multitouch screen with a 1280 x 720 resolution. That blows the 960 X 540 screen of the Droid RAZR MAXX away.
The Droid RAZR MAXX has 16GB of internal storage and a MicroSD slot that (officially) supports up to a 32GB MicroSD card, although many have been successful in getting a 64GB card to work without incident. In contrast, the Droid RAZR MAXX HD comes with 32GB of internal storage. In the MAXX HD, the SIM card and SD card door is no longer accessible by fingernail but now requires a pin to be inserted into a tiny hole in the side. This makes for SD card changes that are less user-friendly but with 32GB of internal storage and a 32GB (or 64GB) SD card, do you really need to remove and replace the SD card all that much? Well maybe, if you want to move pics or videos to or from another device.
The Droid RAZR MAXX HD measures 131.9 x 67.9 x 9.3 mm and weighs 157 grams. The slightly smaller and lighter Droid RAZR MAXX is 130.7 x 68.9 x 9 mm and 145 grams.
Physically they are very similar in size, but in look and feel the MAXX HD certainly is a step above, with a full Kevlar back and nice sleek silver metal band around the sides. The MAXX HD has redesigned buttons and the jacks for USB and HDMI have been moved from the top of the phone to the side.
Both phones feature a massive 3300 mAh lithium-ion battery, though with the larger screen you might see slightly shorter battery life with the MAXX HD. The MAXX HD promises up to 21 hours of talk time, 13 hours of video playback or eight hours of web browsing on LTE.
The MAXX HD comes stock with Android Jelly Bean 4.1, whereas the Droid RAZR MAXX is still (officially) on Android Ice Cream Sandwich 4.0 though there is leak for the Android Jelly Bean 4.2 here (
http://www.droidforums.net/forum/dr...lly-bean-leak-classroom-w-mattyp-friends.html).
