Fantasy vs. Science Fiction

All genres are good, except for boring ones (I don't remember who said that – it seems like Voltaire), and also, except for outright stupid commercial stuff like Dondsova's books. I won't even participate in this compromising poll: both genres are close to me – I definitely loved fantasy more before (especially its humorous subgenre, my favorite author is M. Uspensky), and this year I "stumbled upon" the Strugatsky brothers (and don't you dare say they are "stupid domestic science fiction writers" – I'll laugh). By the way, I haven't read Zhelezny yet – are they good? I'll look for them, as they say... And by the way, the Strugatsky brothers have one work that is, shall we say, at the intersection of these two genres: "Hard to Be a God." So there's no need to start wars here! P.S. And how can dragons be invulnerable if even weaker units kill them in packs?