I have both,
BB Preamp and
RC Booster.
I love them both! It's my 2nd time owning a
BB Preamp. My first one was a clone, then an
Andy Timmons sig BB Preamp #449 which was said to be more compressed.
I like the regular
BB Preamp more. Thick sounding, EQ is very responsive to subtle changes and it cleans up really well. I use it as a stand-alone OD. I'll always be a fan of this pedal.
The
RC Booster is somewhat like an "always on" pedal for me as it adds just enough grit and soil on a clean signal while still retaining clarity, chime, and sparkle. Paired with the BB Preamp, both are even more glorifying. Drive tone just thickens really well.