Digital BW, The Print

I have a set of MIS Variable Sepia on order.

Before I load my CIS system for first time - what
are the pros and cons of using the MIS black vs.
the Gen4 black?

Gen4 black is reported to be 25% dye and produces
more black density.

AFAIK - there is no compatibility problem. But what
about esthetics?  Longevity?

Thanks in Advance,
Steve Tucker