Audi TT vs. Infiniti G35? Help please!?

So I am selling my 2003 Infiniti G35 Coupe and I am planning to buy a 2003-2004 Audi TT but I am concerned about maintenance costs. I have heard several times that it is expensive but expensive can vary from people to people, so my question is; how expensive is maintenance/repairs of an Audi TT compared to the G35? If you can specify numbers I will appreciate it greatly. Thanks in advance.