I have the Milwaukee line up. Low torque stubby (wouldn't recommend), mid torque (love it, use it all the time. Has done everything I need), and the high torque (it's a beast and I've only used it once). All of these are the m18. I've recommended that mid torque to everyone. It's small, light, and has plenty of ass to bust lug nuts loose.
Other guys on here have had good luck with the rigid tools and from what I hear, they have a lifetime warranty on batteries. I chose Milwaukee because my friend has a ton of them and uses them everyday in a body shop. If they hold up for him, they will be great for me.