I've driven both of these cars as loaners and previously owned a 330i (has a slight edge in power over the 328i).
Infiniti G35S
Surprisingly quick. The engine revs easily and the handling it actually quite good. Though in the Infiniti, I always got the feeling that it had the feeling that the power somewhat exceeds the handling.
BMW 328i
Faster than the 230hp would suggest. In the BMW you feel that the car can handle whatever power you can give it. It seems like a more "solid" car.
In the end, if you go with the G35S you will definitely have better straight line performance. In the curves, both cars have similar capabilities, but the BMW has a better "feel". Ideally, I would look for a CPO BMW 335i. If not, I hate to say it, but the Infiniti may be the better deal.
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2008 BMW 535i Space Gray, Black Leather, Dark Bamboo Trim| Sport Automatic with Paddles | Sport Package
2008 BMW M5 (gone, but not forgotten) Space Gray, Silverstone Merino Leather, Madeira Walnut Wood Trim | 7speed SMG | All options
Mods: Corsa Exhaust | RPI Ram Air Intake | H&R Sport Springs | Rogue Engineering 12mm spacers
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