Have to agree about Androids being a LOT different to Blade Runner - they're barely similar in some respects I'm certainly glad I saw the film first as that way the original story didn't jar with what you saw and they're both good, just completely different in approach.
Anyway - I went trad with my sci-fi vote and did H.G Wells as we owe so much to him
"Some men see things as they are and ask why. Others dream things that never were and ask why not.” George Bernard Shaw
I voted Ursala Le Guinn for SF and Jack Vance for Fantasy one of my all time favorite authors, almost voted for William Heaney aka Graham Joyce as I have a copy of that but that was before I spotted Vance's Dying Earth.
He willnae tak' a drink! I think he's deid! , on the other hand though A Midgie in yir hand is worth twa up yir kilt.