Both of these are fully loaded GPS systems with large 5″ screens, free lifetime map updates, and free lifetime traffic updates.
The only difference is that the 1490LMT adds Bluetooth to the 1450LMT and the 1490LMT is black instead of silver.
-Sunlight-readable, 5-inch backlit TFT color touchscreen display with 480 x 272 WQVGA pixel resolution
-Preloaded with City Navigator NT data for the lower 48 states, Hawaii, Puerto Rico, and Canada, with nearly six million points of interest
-Free lifetime map and traffic updates for the most up-to-date maps, POIs, and navigation info, along with constantly updated traffic information
-Advanced navigation features including voice-prompted turn-by-turn directions, lane assist with junction view, fuel-saving ecoRoute
-Includes travel tools such as JPEG picture viewer, world travel clock, currency/measurement converters, calculator and more
-480 x 272 pixels WQVGA color TFT with white backlight
-5 inch easy-to-use enhanced touchscreen interface
-Comes with lifetime traffic and mapping updates
-Multiple Point Routing; Lane Assist; Junction View; EcoRoute fuel efficient routing
-Preloaded with City Navigator NT for North America