I like the Buddy Guy version of the bass line; it has a bit of funk (1/16th octave notes thrown in), and is more melodic. The Committments strikes me as a simplified version of Wilson Picket, and is the least interesting of the three.
However, when I hear the entire bands, I prefer the Committments version. The Committments sound is stripped down, with more emphasis on the vocals. I would love to hear the Committments full band but with the Buddy Guy bass line.
Here's an uptempo version by a "power trio" cover band I was in back in 1999. It's different from the Pickett/Guy riff. And to give credit, the bass player on Pickett's classic original was David Hood from the famous Muscle Shoals rhythm section.