too many people want the cheapest solution. You only have to do it once..if you hire someone who does it right. Whether it's uprooting or grinding, you need to find a contractor that you can do business with. The cheapest guy may not have insurance or decent equipment. What may take the more expensive guy a day and a half could take a week with EL Cheapo who may be running worn out, leaky equipment.
Look for a long-term relationship. A friend. An astute businessman and/or owner operator will be competitive with pricing but will likely be a few dollars more. In the scheme of things, it's worth paying a little more for the guy who can fix it all and won't camp out on your property while his beaten down old machine rusts.
Ask around your area for a good company who has insurance. You don't want farmer Ted coming over with his old cable dozer and tearing up your pastures and or damaging something only to find out ole' Ted has no insurance.
There is no barrier to entry in this line of work so the consumer really has to be careful. What may seem like a good deal can set you up for a nightmare of pain. Sure, uprooting stumps isn't brain surgery but a lot of finesse along the way will ensure less cost later to fix the ruts, stump holes, and mess the cheap guy left.