What is the question? Top pick of what? Artist? My current favorite is Anderson .Paak! Pedals? I think a tuner and compression would be all you need. Bass? Any P or J style bass.
Really depends upon your definition of "R&B", "soul", "gospel" etc. Classic Motown means a P with flats, and hopefully a tube amp. Modern stuff means round wound strings, possibly a 5. If we are talking Bootsy, you better be prepared to dance around your pedal board.
Are you asking for bass and rig recommendations? Not sure of the question. If so... Bass: Depends on the music but a 5 string will definitely cover modern gospel. A lot of Eb, D and C based tunes. Old school R&B, you can get away with a 4 string. Newer stuff.....5 string. Rig: Minimum 500w-800w amp. Multi-speaker (2x12, 4x10, 2x10) or multiple cabs (1x12, 2x10)
I use a pedal tuner and compressor. Got a Bass Chorus because my BL wants that in some songs. Flats. Plenty of amps (already mentioned). I use 2x12 and 550 watt Fusion amp which is not right on target but can still work if you use fingers instead of a pick. Play mid-neck on a lot of songs and that gets me closer to boogie perfection.
I play modern Praise/Worship & Urban Gospel. I also play 70'-80' OldSchool Funk and Hip Hop , Motown and Modern R&B . The Fender Rumble 40 is for recording /practice /small open mike type settings, and getting that old school warmth. The GK 212ii is 500 watts 2X12 Neo light weight combo. I have TI Flats on my Caprice, Marcus Miller Signature DR rounds on the Sire V3-5string Jazz Bass, and Ernie Ball Cobalt Flats (bright flats) on my MusicMan Stingray5 Special. The Caprice is passive P/H (inline humbucker), The Sire active/passive, the Stingray5 Special is active.