Hi Mary,
Personaly I'd prefer to race class racing.
For me, racing the Tornado at club level in a mixed fleet is a bit disapointing as you are out in front with no body pushing you (except for the other couple of Ts). Racing against slower boats you learn how to pass them quickley and are rarely challenged (You also learn how to dodge the downwind

) In class fleet racing it is allot harder to pass a competitor and you also have to defend you own possition.
The couple of Tornado regattas we do per season, I learn 10 times as much than all the club races and sail training over the season.
If you have the oportunity for example to race in a large class fleet (OD, Formula or Development class)say every weekend..... Why would you want to give that up and race mixed.