1991-1999 G20s all have the same bottom end. The heads changed during that time span. 91-93, 94-96, 99(same head slightly different intake manifold). From 2000-2002 the USDM sr20s came with the RR motor, which has no girdle and a 4 counter weight crankshaft.
I'm assuming you mean better for turbo? If it was me I'd go with the early blocks as they come with the main bearing girdle.