This one of those "can't win" questions. In my opinion, there isn't a single manufacturer out there that excels in everything. My own gear is a smorgasboard of brands - Oceanic Delta 3 reg, Scubapro Superhawk BC, Aeris Velocity fins, Cressi bug-eye mask, Sherwood Logic computer...
But overall, I think Oceanic makes the most consistently high quality products. Their line of BC's (men and women), regulators, fins, and computers seem to rank very high in every comparison test. They are never the "best" in any particular category, but they are always good.
I would have voted for Scubapro but they don't really make their own brand-name computers (they bought Uwatec). I know that Oceanic computers are made by Palagic, but at least they carry the Oceanic name.
I also think very highly of Sherwood (great reputation for reliability) and Aeris (have heard nothing but raves about their customer service).