I personally went the series 2 PM35 for a few reasons.
1. Parts are alot easier to find for the vq35, there's alot of aftermarket parts and tuning available for the vq35 compared to the vq25. It's very quite simply to turbo the vq35 if you really want a turbo.
2. The PM35 looks better, nicer front end and interior.
3. The vq35 models are not as common where I'm living, I have the only PM35 in town so I like the uniqueness.