Here's the first scale, and it's probably the one most people are familiar with.
BEFORE we start with the scale options, it should be noted that you can make your blues solo sound a certain way based on the scale you choose to employ over the different chords. Some blues have a happier or brighter sound while others are more gutsy and abrasive sounding, as well as many other flavors.
This is the MINOR PENTATONIC BLUES SCALE for A Blues in two positions that neighbor each other on the fretboard. SCALE FLAVOR: ABRASIVE,
TOUGH, CLASSIC HARD BLUES SOUND