I don't think he's asking about CTR rods, he's just saying the Rod/Strke ratio is slightly better in the B16A for High-Rpm operation, which is correct. The pistons help, but the main thing you need to Rev really high is an ITR head, or more specifically a more durable valvetrain to handle the extra stress at high rpm. U should get ITR cams, get ITR or aftermarket intake & exhaust valve springs, and ITR or aftermarket valve spring retainers. Then u should be able to rev to 9000+ rpms. Also, the stock B-series blocks are very durable for High-rpm, especially the ones designedfor it, ie. ITR-B18C5, B16A, B17A, B18C1, so the R/S ratio is important but I think it's very close between GSR and B16A, so it's a matter of cost then, and the B16A wins everytime.
Later,
Mike