Choosing a character in a fighting game is quite a process. We should consider our own preferences in style (and personality) and general might — yep, everyone enjoys winning matches in a competitive environment.
There are different approaches to this selection process. Two of them are nicely highlighted in these SC6 tier lists by JJJ. If you want to have an easy-to-play character who is fundamentally powerful, choose someone from the left chart. If you want someone fun-to-play, take a look at the right chart.
Some intersections are sure there. So, why not both?