The sci-fi books are both by Glen Cook: A passage at arms and The Dragon Never Sleeps.
The fantasy book was Holdstock's Mythago Wood.
Glen Cook is a truly great pulp novelist and I've read an embarrassing amount of his books and would recommend them all. These are no different.
Passage is a blatant Das Boot rip off but the setting is space. Very tense and forgot the Das Boot thing quickly.
The Dragon Never Sleeps is my second favorite sci-fi book of all time. Bester's The Stars My Destination is my far and away favorite. But TDNS is incredible. It's exploding with cool ideas. It's the Fall of Rome in space with insane AI self-directed starships instead of Legions. The clone stuff is maybe goofy. I have to read it again more closely. Backstory of the book is that Cook's publisher was an ass so Cook jammed an entire series into one book to fulfill his contract. It's a crime there's no HBO series made from this.
Mythago Wood is a jungian take on Celtic and shamanic myths. Holdstock tries to recreate the mindset of a pre-Christian pagan. Holdstock is a world class expert on Myths. Well worth the read. It's out there but a fun read and well worth the time.
Mythago Wood and the sequels are stunning works jammed full of ancient myth and symbolism.
Cook is just a fantastic storyteller. I'd recommend the first 4 books of the Black Company series to anybody. If you really love them, you can keep going and finish it out. The Silver Spike runs a very close second to the best book in the series after The Black Company.
Funny you mention Bester, Benny, I just reread that.
Holdstock's Iron Grail series is impossibly good. That and Gene Wolfe's Soldier of the Mist are the top for me. At least as far as genre transcending art. The caveat with Wolfe is of course that he's a Cabbalist and that is the very worst juju... i have a screen shot of an interview with Wolfe and he's really verbose and open until the interviewer asks him how and when he came to realize all the occulted forces working to control the world... he says "no comment". Looooool. Idk. Wolfe's kind of perverse...
Clark Ashton Smith and Cook and Howard and Burroughs are the top pulp writers for me.
Bester is somewhere in the middle stylistically, I think.
The wild-card is R A Lafferty. He's probably the greatest of them all but he's so esoteric and complex, I honestly get overwhelmed. I mean, researching the Ottonian dynasty and the Spanish Carlists to figure out just one damn thing is a little much... But then sometimes I just read him for the high-weirdness and awe and accept I understand nothing hahahah
PS. The King in Yellow and Machen's stuff is wild and fun and well written but almost certainly evil.