If you are chasing the roughies the Divi. Plus would be the way to go because it gives you the best price of all state TABs put together plus 5% on top.Stats show that the TAB horses $5.10+ range pay better than bookies 70% of the time.
If you are looking at the newspaper pre-post prices, its not a bad rule to knock 1-1.5 points off the price shown in the paper.

You will see how close the final figure is ,along with the odd overs in there, check out some past form guides & you will see what I mean.

If you are chasing the $5.00 a less runners you will find the book makers fixed price the stronger option, longterm.

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Cheers.