Sorry . . .I posted that yesterday while doing 3 other things. All references to 305, 205, 10x, 201 are Garmin, not polar. Polar is footpod (which I like) not GPS.

I have the forerunner as my background is a runner. The edge will not help you much when you run as you would have to hold it or mount it somehow. The forerunner can do bike cadance (if you get the thing for your bike) and it is easy to mount on your bars (with a little bit of foam or something to wrap around your bars).

I prefer the Garmin 305 forerunner in all the products I have tried. That said, I have not tried the new higher end polar stuff with the smaller footpod.
Polar is better with heartrate - their strap is MUCH better than Garmin.

Garmin has a rechargable battery, which at the time was very important to me, as I ran most of my miles in the dark before the sun came up. You can leave the backlight on all the time and not worry about it as you just pop it on the charger. The polar you could not do that. In addition, the backlight on the polar 625x was worse than words can describe.

Training software . . . the higher end polars have a wealth of information. the 200sd did not. Garmin has all the info I like, but I do not use their software. I use sporttracks, which is free. It maps my runs/rides, smooths out the elevation, etc.

You will not go wrong with either the 305 forerunner or the newer high end polar stuff. However, I think the new polar stuff does not tie in with any of their bike stuff . . . which may or may not matter to you.