See now everyone loves Showa Gigan, but I'd say up until a year or two ago I'd only heard two or three people prefer Showa over Millennium. Not that I disagree - though I do like the Millennium design, I think Showa ends up an overall better monster.
Yeah that's pretty much my opinion.
The Megalon suit is detailed, but the material it is made of looks rather fakeish. That's my main beef agaisnt it. Gigan suffers abit from this, but certainly less. If detail, detail, detail meant everything, the Heisei suits wouldn't be hated so much.
I understand the concentrated internet American fanbase seems to absolutely adore Grand King Ghidora and FW Gigan but as a whole - and especially in Japan - the original versions are far and away considered superior.
But since most of TK fits into that category, is it THAT much of a surprise that I prefer the FW Gigan? (like you and Goji seemed to be implying anyway)