Nismo (rays) LM GT2 vs Standard r33 rims on an R32 GTR. Advice needed

[gtr33m]

Got a bit of a dilema and I need some advice from those in the know.

I have either standard R33 GTR wheels or a set of Nismo (Rays) LM GT2 from an R33 GTR and I need to know which would be best on an R32 GTR.

I don't know the offset of the R33 wheels or know for sure the offset of the LM GT2s, however from the volkracing website I can guess that the offset for the GT2s is 16.

Both are 17x9 with 245x45 rubber.

I have had conflicting reports as to the best offset on an R32 GTR. I have seen 18 and I have seen 23.

Does anyone know what the best offset would be for handling on an R32 GTR?

Does anyone know how to measure the offset on a wheel?

I'd also be interested in knowing what the weight difference is in the two wheels. The LM GT2s look heavier, but I haven't checked without a tyre to see.

Sorry for all the questions, but I need to make a decision soon, and once made, I can't switch back. Also won't have time to get on the track and see which one I like better.

Thanks,