I own both, happen to be wearing the P.O. today on the OEM bracelet. Yes, it's a big chunk O' steel -- especially with the bracelet. I also have the OEM rubber strap which takes a lot of weight off. Sometimes I get in the mood for chunky and actually enjoy the weightiness and the way it can't be easily hid under a shirt cuff. It's a watch that's hard to forget you're wearing.
The Speedmaster Pro with acrylic crystal feels much lighter, even when it's on an OEM bracelet. If you put it on a leather strap you could forget you're wearing it (if it weren't for all those times you pull back your shirt cuff to admire it
) If a Speedmaster Pro is shiny and not too beat up you can sneak it in as a tool-y dress watch, especially if it's on a nice leather strap.
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