Sorry Shaun, I'm very much a novice at this and can't possibly claim the knowledge of other more experienced forum members.

However, I find the prices available better than on the gallops.
A $2.50 fav is winning far more often in dog racing than in horse racing??? At least that's what I found so far!

The multiples, in comparison to gallops are, in my opinion much better, if you consider the number of runners.

Today I bet 12 quinellas costing $3.00 ea. and had 5 paying over $25 and 1 paying $4.6.

I don't yet bet any other multiples, trying to get my selection process right, and so I don't know if Betfair would be offering better prices, I suspect it would.

I make my living off the gallops but if I can make this work I may just switch over, the selections are far easier, "FOR ME" and I try to avoid the jockeys.
There is one I used to rely on and now this jock owes me over $2000 just in the last two weeks!
Cant bring them home even when the horse is rated highly by myself and others.

When I have my selection process right, I can give some hints as to what I do, not all I'm afraid, but enough for the astute punter to get the gist of it.

Good luck