I'm not saying anything new here, but I'll add my opinion.
I was facing the same decision a few months ago. P5, 3, Golf, and SVT Focus were mine of interest.
The big killers with VW are the reliability and parts cost. Especially in the last several years, vdubs have just gone downhill. German labor is so expensive, and VW so desperate to cut costs, that all stops have been taken. Production in Mexico is just one example. But so many areas of their cars are just flat out unreliable now.
The SVT Focus is still the best handling, best driving factory FWD sport compact I've ever had the privilege of driving. But they are a little harder to find and cost a bit too much used for me. Nothing show stopping and I would have been very happy with one.
Mazda reliability is superb IMO. I have a '90 Miata btw. The 3 is actually a very nice car (but styling is not as good as the P5 IMO), but I just didn't want to pay new prices ultimately. Plus the P5 is such a driver's car. Power is not everything. The P5 is so much like a Miata. It feels quick in every way, even if it's not quick off the line. But when you look forward to any reason to drive and come away smiling, then 0-60 times are meaningless.
Doug