I trade both mini dow and FTSE futures. I think it does depend on which indice suits your personality. Because the Dow is only 30 unweighted stocks it is much more volatile than the FTSE. I've lost count of the number of times when one stock like Pifzer or Altria has completely distorted the Dow. With the FTSE I keep a window open with BP, SHEL, GSK, AZN, HSBC, AAL and RTZ prices so I know how the main sectors are doing. As a rule of thumb, if the oils are down and one other sector (banks, miners or pharmas) then the FTSE will struggle.
As has been said before you have to be disciplined and be prepared to take small losses. I can use relatively tight stops of around 10 - 20 points and I rarely am stopped out. That said, I am a very short term trader.
Another advantage is that, you are not being bombarded with data the way you experience with the US markets.
Lastly, in the morning, it is quite possible to use the Dow and S&P futures to trade off. The relationship is not perfect but, other things being equal, the FTSE does respond.