Fit bit or BodyMedia? Polar?

So I have been really considering buying either a Fitbit or one of the BodyMedia FIT's bands to track my calorie burn, excercise, sleep etc....I know the BodyMedia has a monthly charge. I can get both of these for about the same price, so which gives you the more bang for your buck? I am also considering one of the Polar HRM's because they offer HRM, calorie burn etc..sooo
Which is more accurate?
Ease of use?
Customer service?
Here is an off the wall question for anyone who rides horses...are either of these able to give you a idea of how many calories you burn while riding?

I am concentrating on improving my fitness level while losing a large amount of weight, I am very active working out 6 days a week, hiking, gardening and being outdoors. So I need something that can handle it.

thanks!