Well i had an account with Betfair before and it really sucks. As they only offer betting on the telephone and you can’t bet online. If you want to do in-play betting and I find it easier doing it online, as I normally bet on footy and cricket. By the time you call Betfair the best odds are changed dramatically. Now i started using Betdaq and found it really great and much more convenient. To open an account all you have to do is send these documents to them your driving license, a utility bill and your credit card copy for identity check and you are all set to go. The liquidity that is their in betfair is more but still i hate when you have to call them all the time as the best odds can change in seconds. Specially when you are betting a reasonable amount in one game so liquidity does not matter much. Also the commission rate is less only 2.5% compare to 5% in betfair.
So I think Betdaq is better as it offers in-play betting online not over the phone.What do u think?

Actually after doing some research I decided to write a review of betfair and betdaq that I have posted on a website.

Have a look if your trying decide which to use.