I've only used the mi audio tube zone and mxr custom badass overdrive. Both really nice overdrives for different reasons. The mxr gives more of its own signature sound no matter what settings, but it's what I use all the time. Some say it's like a tubescreamer when the bump is on and a Timmy when it's off, But I've never tried either of those with my setup so I couldn't comment on it... All I know is it sounds good in front of a cranked crunchbox and can go from creamy blues to saturated metal with a little tweak of the volume knob on my guitar.
The tubezone has more versatility and is definitely a nice od that can be cranked to a distortion very easily by itself.
Personally, I think I'm going to stick to the mxr, so that's my recommendation for ya. They're not too pricey either.