GT3 is one of the best track cars in the world, but for daily use where the engine is not above 5000 rpm all the times, low end torque, power, and linear acceleration could be better. For daily usage, this is a high revving, high strung car with bone rattling suspension that is not necessarily "the best solution" for everyone. I would love to have one, but only for the weekends.
For road feel, seat of pants fun, etc., how about something lighter and arguably feel even more direct, like the Lotus Exige? What I mean is there is no best solution, you are going to gain something, and lose something every direction that you choose to go. There is a continuum and neither the Turbo nor the GT3 is the be all and end all of sport cars.
BTW, if/when
I do buy the GT3 (next generation, hopefully with better low end power and PSM, to add to my Turbo), the first thing I would do is find a way to get rid of that Taco shape rear wing. I know I am in the minority here, well maybe MMD, and it's purely a matter of personal taste, but the GT3 rear wing is the most awkward looking of all 911's to my eyes. But I know, YMMV, some people love it, I think it's kinda ugly.
The way you asked the question, I think switching to GT3 is a good decision for you. Don't come back and tell us we didn't warn you are going to miss THE be-all and end-all explosive acceleration of the Turbo though
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P.S. The way they stop production of GT3 altogether, is it possible some significant change (more power plus wimpy
PSM ??) is just around the corner? In other words, you are going to take a big hit trading in your Turbo anyway, why not wait and see the announcement? The car is produced in limited number, but it's no Scuderia, so what's the hurry?