Well, for starters, like you mentioned, Sano did really sculpt the ultimate alien as giger created it. Without compromise, without revision, this alien is the 6 fingered monstrosity without transverse ribs hiding the gloved hands, paired fingers, and sans elbow Spurs. The alien also has the icier version of the anthropomorphic skull, without the ferocity of the rimbaldi look, but just as creepy. The sano is a basic grey with darker and lighter tones highlighting the shapes and surface details, but lacks the color texture of the actual suit. It's a great representation of the study of the form, the design of the character, but doesn't represent the creature in the film the way the artfx+ does.
The artfx+ masterfully captures the fluidity of the suit itself, with ripples in the latex in addition to the beautifully applied color texture. The gloved hands, the pose is well balanced and the sculpted details are impeccably recreated. Every effort was made to ensure that details are not blown out or fudged just to compensate for any lack of molding ability ... They went all out and the result is just spectacular. Even the head carapace is the correct shape and wasn't just vaguely similar due to the inability to capture the width or the sharper details of the center ridge...the subtle opaque frosting used to obscure the post which holds it in place is a sly but successful attempt....
The neca holds a special place in my heart because the sculptor is the same guy who originally did the mcfarlane alien, though it was intended to be more stylized and dynamic As it was mcfarlane toys's signature. The latest sculpt is a vast improvement over the mcfarlane and just a few tweaks ahead of the previous neca sculpt. The dome was improved, but still needs more width to it. The biggest improvement was the multiple points of hinge and swivel articulation vs the fixed pose with cut joints...it's an impressive figure like its predecessor and is the "new Kenner."
But since I'm saying my peace...
JAKKS GET THE LICENSE FOR ALIEN, ALIEN WARRIOR, AND THE QUEEN. 31" big chap please! It's a license you could definitely use! Oh heck also predator, terminator, robocop, and universal monsters.