Okay small sample so will vary long term no doubt.
From Saturday, Rosehill and Flemington.

$10 and under
18 races
BFSP total divs added up - 426.58
Best tote divs added up - 394.7

BF Advantage - 8%

Winners only under $10
17 winners
BFSP - 96.45
Best Tote - 88.8

BF Advantage - 8%

through my beer affected dodgy calculations........ after commission (so take with grain of salt), BF advantage of approx 4%.

Be interested if anyone has collected more of these figures for comparison?