I'm neither of these, but the way i understand it is that the East Coast guys are more into the runs.
The West Coast guys focus on playing a specific chord (hardly any runs..maybe that 1 or 2 short bass run). Normally the RH chord will be played in different inversions, with plenty of grace notes inbetween..
If you look at most chords posted here, I'd say 90% represent West Coast style of playing.
The Mike Bereal stuff is mostly West Coast.
lets look at a simple 7-3-6 progression:
I know most West Coast guys would rather play it like this, say in DbM:
[7] C/ Bb-^Db-Eb-Gb ^= trill/ hit note for split second.
[3] F/ A-Db-Eb-Ab
[6] Bb/ Bb-Db-F-^Gb-Ab
The trills act as grace notes in this instance.
I'm sure an East Coast guy would either play those RH chords as runs or play some runs inbetween those chords
Alternatively, the guys might play the progression in tritones:
[7] C/ Bb-E
[3] F/ A-Eb
[6] Bb/ Ab-D
I think players from both coasts might play it ike this, but then the East Coast guy might do some fancy run to take him to the 5 (Ab) of Db. A West Coast guy on the other hand might play 1 or 2 passing chords to get to the 5..
That's just my 1cent..