I did a study a few months back on the returns from various Tabs on exotics and contrasted that with the return on best div. In all cases the best div return was at least 10% better than the return on the highest paying Tab. Total Tab returns varied up to 5 or 10% in some cases but which Tab payed highest varied so as someone said above it doesn't seem to make much difference which Tab you bet with. The study was on a total of over 3000 races betting at the shorter end of the market.
As a result I make sure I bet with IAS for exotics, they pay at least as well as the second best Tab divvy on any race and often better than best div on shorter priced wins. This has turned what would have been an ordinary performance for me betting quinellas over the last couple of months into a healthy profit.
I'm not sure if best div on wins or place would be as marked a difference but I suggest every percent you can get back adds to your bottom line. And of course, you aren't flattening the divvies with your bets if you avoid the TAB.

KV