ohhh this is too much fun not to weigh in on.
over all other artists, giger has probably influenced my work the most. his imagination, attention to form, and execution are unlike a lot of other artists. he is a master at taking the concepts and images in his head, and putting them down "on paper" (he is also an accomplished mixed-media artist and sculptor) in a professional, finished work of art.
winston, on the other hand, manages more things than just himself and his imagination. giger has a handful of design concepts that were able to be executed exclusively by him, while winston has a portfolio. no, stan winston did not use his bare hands to create every creature that his studio turned out - however, if it were not for his knowledge of artistry and his craft, he would have never been in a position to assemble a hand-picked (by him) group of artists to execute the projects HE was able to secure. he coached a team of artists who's designs were not only great, but all functional, for whatever a story-writer asked for.
in terms of output, as an artist, in my opinion, stan winston CRUSHES giger. giger made the alien. stan made it functional - which is what you need to actually create a reality. NOW I KNOW giger sculpted the original suit, but i think its arguable just how functional it was - and thats all it was - a suit - not a character, not a creature - other people had to help bring that to life. artistry aside - aliens introduced you to a creature that you could actually see pursuing the protagonists - up walls, across ceilings, jumping, tail-whipping... wereas alien had a creature the protagonists had to come to - he hung, hid, crouched... was generally a big unexciting pussy of a creature. especially early on it was STAN WINSTON'S team (not just a team) that created, sculpted, engineered, and acted as the characters they brought to life. giger had the imagination, winston had the know-how. how does that saying go? something like imagine in one hand and shit in the other and see which fills first?
giger has this mystique about him because he creates dark, surrealistic art totally of his own. he's not part of any genre - his work is very distinctive. a lot of people like to see his work and personality as a weird gateway into an evil, weird place. well, thats gay. he's just an accomplished artist. he's not a dark wizard.