I used to use Goodreads, but switched to StoryGraph at the beginning of the year, and haven’t looked back. The only time I refer to Goodreads now is when I want to know if a book in a series can be read standalone, since that’s often mentioned in their question/answer section for the book, and it saves risking spoilers by reading reviews.

Though that said, I’ve yet to come across a spoilery review (that wasn’t indicated as such) on StoryGraph…

I looked at BookWyrm, and did set up an account on an instance, but I prefer StoryGraph.

ETA: I haven’t really looked at the recommendations feature on StoryGraph, so I can’t help you with how well that does or doesn’t work. My TBR is way too long already…!

I liked the Silo series too. Hoping to watch the TV adaptation at some point.

Some of my favourites:
Murderbot series by Martha Wells
Imperial Radch series (Ancillary Justice/Sword/Mercy) by Ann Leckie
Vorkosigan Saga by Lois McMaster Bujold
Dogs of War duology by Adrian Tchaikovsky
The Expanse series by James S A Corey
Monk & Robot series by Becky Chambers

I’ve not read the Xeelee series so can’t say if there’s any similarities, but they are all excellent sci-fi series and well worth your time.