[killerkhatiby009]

It really all depends on what you need/like. If you want a keyboard and wi fi go with the treo or the mogul. If you want it to look sleek, and don't need a keyboard or wi fi go with the touch.
The major difference between the treo and the touch is that the treo has a keyboard and wi fi, but a smaller, recessed screen. While the touch has no keyboard and no wi fi, but is much thinner, has a bigger and flush screen. Lastly the mogul has a keyboard, wi fi, a big screen (recessed), but less ram.

-If you need a keyboard and wi fi, but like having the larger screen/device, but less ram, go with the Mogul.
-If you need a keyboard, wi fi, and ram, but the screen/device size is not an issue, go with the Treo
-If you don't need a keyboard, and wi fi, but need the ram and a larger screen as well as a thin device, go with the Touch.

they all have their own advantages and disadvantages, and it really all boils down to each individuals needs. Some like the mogul, some the touch, and others the treo, as for me I like the mogul, but have recently decided i don't need the keyboard or wi fi (or camera flash) and am probably gonna switch to the touch (if i really am over losing those things). Good luck with deciding, hope this helps. Although it probably wasn't anything u already didn't know.