OHC is smoother, OHV is inherently less expensive to maintain/repair, and IMO far more reliable(if for no other reason than most of the legendary OHV's have chains and not belts).
How many naturally aspirated V-6s in large family cars can ever put a smile on someone's face?
Put a latest generation naturally aspirated 3800 V-6 in a Fierro(for instance) and you'd be grinning like a school boy for all the live long day. Hehe.
