Just reading through the links...I'd trust the MCP one a LOT more than the chambers unless you just like glint and glamor and high price tags but I could be wrong.
One talks about wad guns, the other has no direct competition gun posted to boot.
I'd go with Joe were it me. I'm not an expert but he's one hell of a nice guy when I've talked with him.
His pistols have won over 70 matches and championships at Perry alone and I read somewhere in 2012 his guns took 26 matches or championships and set 2 National records.
Joe can build a good 1911 for bullseye work.
