I don't see how this question is of any grave importance. Its
your money and its ultimately your choice. That being said, I would
go with the Tamiya.
Though be criticised heavily for using resin parts, the Tamiya
is probably the best scaled representation so far. Having resin
parts means they details are finer, more realistic and to scale and
of course, better paint finish.
Its 1/12 you are talking about. You have any idea how heavy a
1/12 diecast is? Look at some of the 1/12 Murcielagos from AA, the
rubber tyres are taking the strain from the weight of the model,
you can display them on the tyres for too long.
I've got a copy of the BBR 1/18 and sold it. Its a very detailed
model but finishing is just slightly better than average and I just
hated the doors, which can't be opened fully.