use a full synthetic oil or not ???

[Harry hyper]

I have 2012 busa that is due for its 12k service , my dealer savage Suzuki recommend a full synthetic oil . due to these guys being so busy ,I`m looking elsewhere to get the work done . another dealer said I should stay away from a fully synthetic oil . I was told if I like to give it a bit of stick (drag racing ect ) a fully synthetic oil could cause clutch problems . can anyone give me an opinion please ??????
matt