In all phases including GPS Accuracy, Processing and Computing Power, Storage, Componants and Price, the MobileMapper 100 beats the Trible Geo handsdown.

Right out of the box, the MM100 is almost twice as accurate as the Geo with its 30 cm accuracy.  The MM100 is also loading with the with the newest version of Windows Mobile (6.5), a 806 MHz processory, 256 MB RAM, 1 G Data storage expandable to 32 G with a SDHC card. 

The MM100 includes a 3 MP camera that can be used as a barcode scanner (with additonal software.  Pack all this in a rugged case that can stand a 1.3m drop onto concrete and make it waterproof and you have Mapping GPS that the competitors can't touch.

For more information, check out the spec sheet http://www.mobilemapper100.com/specs.html or the Trimble comparison page http://www.mobilemapper100.com/mm100-vs-trimble.html.