6 & 8 deck SCORE comparo...
Here are some 6 & 8 deck SCORE numbers from a post by Bootlegger:
Here is some data from BJRM, assuming $10,000 bank and $25 units with OPTIMAL BETS:
GAME SCORE PLAY ALL SCORE WONG
4/6 S17DAS $11.97 $27.14
6/8 S17DAS $11.42 $27.35
4/6 S17DASLS $20.88 $40.83
6/8 S17DASLS $19.80 $40.45
Again, Hi-LO Ill 18 and fab 4, $10,000 bank, Optimal bets and units:
GAME SCORE PLAY ALL SCORE WONG
5/6 S17DAS $33.64 $63.84
7/8 S17DAS $26.42 $55.20
5/6 S17DASLS $52.27 $90.44
7/8 S17DASLS $42.64 $78.50
Here the 6 deck game is CLEARLY superior!
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Note that with shallow pen there is little difference, but as pen increases, the 6 decker takes off.
ANS
p.s.: I have to disagree with zg's -3 wong out recommendation. This game requires a much more aggressive approach. Without getting into detail, a shoe with that shallow penetration tends to stay fairly neutral more often than usual, resulting in less times spent at higher/lower counts. I don't have an exact number on hand, but I would venture to guess that this shoe would reach -3 as infrequently as 5%-6% of the time (maybe 7%-8%), which would allow far too many hands to be played at -2, -1, and 0, causing high variance and a stunted ev.