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I own F80 M3 comp and recently got 991.2 T. Also shopped around for GT350.

It depends on what you are looking for.
To me, I much prefer M3 > GT350 and 911 is not even fair here.

GT350 has a great motor, love the design and ofcourse the sound but everything else is a compromise. Build quality sucks, interior is cheap, seating position is horrendous. The car feels Huge even compared to M3 where u sit lower and everything is much better designed around you. The low end torque on the M3 is much more useable than in GT350.

991.1 with NA motors will feel slower compared to M3 but the handling is amazing.
991.2 is the perfect package no matter which engine you get as you can tune it. The exhaust sounds much better than M3 and DCT is much smoother.

One thing about Porsche - you need to make sure the car you get has the right options which is why I went with 911 T that has all the sport options like sport exhaust, lower PASM suspension, SportChrono and my car also has Rear Wheel Steering. I test drove a base Carrera, S, GTS - all are different. Zillions of configurations on P cars so u need to take your time and test as many as u can. The other great thing is Porsche CPO gives you 2yrs of warranty coverage with unlimited miles.