I have both a 9900 and a 9800 through T-Mobile. Just back in the country whee I can optimize. Any recommendation as to which of the two would be a better device?

I had a 9800 and gave it up for the 9900, because of the larger physical keypad vs the crampted keypad on the 9800. The 9900 runs os 7 and 7.1 while the 9800 cannot (although the 9810 can.) The processor in the 9900 is much faster than the 9800. The 9900 is just a better more current model than the 9800, although I did enjoy the larger touch screen on the 9800. I like the Blackberry for what it does best, e-mail/messaging, and currently the 9900 has the best keypad.