People have beat me to it regarding fuel burn. Enough said... The other thing in the Rotax favour is the installed weight. True comparative weights vary depending on who's claiming it but the Rotax 912S is at least 50lbs lighter than an O-200D. On a 1320lb MAUW aeroplane throwing 50lbs away needlessly was not Cessna's finest move...
On its delivery flight from Italy, our P2002-JF averaged 16LPH at 100KIAS. Our P2006T twin has a total fuel burn of 38LPH at 135KIAS.
Of course another advantage of the 912s is that it is certified for either Avgas 100LL or Mogas (EN228 Premium Unleaded) and up to 10% Ethanol. In fact it prefers Mogas and if you are burning in excess of 30% Mogas then the oil and filter changes are at 100 hours. And all of 3 litres of oil at that with hardly any burnt between changes. Compare that to the Avgas only O-200D and its 12 litres of oil over a 100 hour period plus whatever it burns getting there...
Regarding the Tecnam brakes. Toe brakes are an option on the P92 and P2002-JF, standard on the P2008 (info from the UK dealer's website:
Tecnam UK ).