I have quite a few of both finishes. In my experience, the black finish wears better. It seems more durable. Also, it looks better when worn. The black / blue does not suffer the flaking problem of the early matte silver version.

Here is a 442 carried regularly (not exclusively) for more than 10 years. A little finish off the muzzle and high spots. It has at least a couple thousand rounds down range and it’s been wet a few times. In fact, it just traveled to Reno with me last week.