Of course this is going to vary depending on the shot, but for a general medium/heavy oil house shot???

I used to be a huge fan of 600 grit wet sanded with a high gloss polish.  It seemed to be enough to get the ball through the heads, yet strong enough to recover on the backend...  I still use this finish on some of my skid/flip equipment, but what I noticed is just that... it gets a little flippy and sometimes hard to control.  Recently I have been playing around with higher grit wet sands...  I have really come to like 2000 grit matte finish.  It seems to have the same characteristics as the 600 grit polish, but a smoother reaction...  so currently, I have to say that 2000 grit matte is my "favorite" finish....  

S^2
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-Strapper Squared

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I've had the most luck with 600-800 grit with a light polish, especially on our THS synthetics.

380 abralon. no polish. hate polish. dull=good. i throw to hard to have shiny stuff.
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like strider...I don't have ONE favorite.....but if I had to ....

it would be 800 smooth....

heavier,...I like 600 smooth, mediums I like 800-1000 smooth, and I also love 800 compound too
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JEFF
"Oh...that's puce"
 Sully; Monsters, Inc.

i tend to try new balls wetsanded 2,000 grit. they tend to roll more evenly and i get a better read that way. i'll make surface adjustments as necessary for a particular ball.