...are the same engine? which one is better try to give me one answer about one of them and why...please please please... i wanna buy one and its tough decision...thanks

Along with all the other answers, don't forget the IS350 costs about $5000 more then the TL or G35 once you've equipped it the same. For the same amout of money as the IS350 is going to cost you I'd be looking at the BMW 335i. However, I would save the $5000+ and buy a used 2005 Kawasaki ZX-6R sportbike along with the G35sedan instead.

I would definitly go with a 2007 Infiniti G35 coupe...they are so cute and soo nice