Thanks for asking! I've used both and get varying results. But the bottom line is this... Gps locks in when I am standing still. But as soon as I get up above 20 mph, it starts moving 3 or more streets in any direction... Very frustrating. I spent a lot of time on the phone with technical support. They went through all the typical troubleshooting... Compass calibration, factory resets, etc. They even put me on hold and got a motorola rep on the line. That rep asked all the same questions and then finally agreed to send me a new phone. Should have it by Friday. I'll check back in after I try the new one for awhile.