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The blues is all about choosing the noise you hear in your head rather than matching a specific scale to a specific chord. The blues scale can be moved from chord to chord, however works best as the scale from the tonic over each chord.
Play the B blues scale over a blues in B (B7, E7, F# 7). Yes, you can play the E blues, and the F# blues over their respective chords, however you’ll be departing from the tonal center a little (which is cool often).
The b5, while not in any of the chords, just works completely. You have to listen to where you wish to utilize it, but it can be hung on or run by quickly. Play some of these jam tracks and remember: use all 5 patterns and link lead lines!