Maybe consider other variations of the 911 if a backseat moves towards a must have since GT3s are void of a backseat.I’d love a 458 but it’s a little beyond my budget sadly. I haven’t driven a GT3 (probably would be a good place to start) although I also hadn’t driven an R8 before I bought one either. I’ve been putting off going to PECLA for fear it would ruin any other car for me.
I would primarily use it as a weekend car. What I like about the 911 is it’s somewhat more usable (although maybe not a GT3 specifically) if we ever want to go on a longer trip since it has backseat space for us and our small dog making it slightly more practical in that sense compared to the R8. I had also considered a 991 (or now a 992) Carrera T before buying my current R8.
My concern with a GT3 is I live in LA which is 911 Mecca. There’s something nice about the uniqueness of being the only or maybe one of 2-3 R8s when showing up at a meet or event vs. being one of dozens of 911s. Also, the lack of a manual on 991.1s is a negative as well.
Coming from a 991.1 (GT3 and RS) and now a 991.2 Touring; I would recommend the .2 variant if you're considering long term ownership.
Additionally, Rennlist is a great forum of enthusiasts and a solid starting point to learn more about all the various versions!