Favorite Sci-Fi Shows?

That is a lot of favorites.

I'm a fan of S1 of Space 1999. S2, not so much.
Ditto for Buck Rogers in the 25th Century
All the Treks except Enterprise and the new one which I haven't seen past ep1.
Sliders S1 & most of S2
BSG04
12 Monkeys
The Expanse
SGU & SG1
Defiance

I would have a similar huge list of past/watched shows that are favourites also, so I thought I'd list the current ones I am enjoying:

Alien Nation
The Orville
Rick and Morty
The Last Man on Earth (a bit sci-fi'ish!)
Dark Matter

I want to really like Star Trek: Discovery but it's not that great.

I like sliders, the X Files and Farscape
Also Roswell, STar Trek shows.

I have a lot of them from the last 50 years or so. Here in no particular order:

Quantum Leap
Doctor Who
All the Star Treks (well I have only seen the pilot episode of Discovery so Only 90% of the Trek shows are on my faves list)
Blakes 7
Space 1999
Voyagers
Timeless
Buck Rogers
Battlestar Galactica Original and Reboot
V Original mini-series, Final Battle, regular series and reboot series
The Twilight Zone
Red Dwarf
Sliders
Andromeda
Lost in Space
Stargate SG1, Stargate: Atlantis
Torchwood
Adventures of Sarah Jane Smith
Warehouse 13
The Orville
Dark Matter
Killjoys
Farscape

There are others I'm sure there have been several Sci-Fi Channel shows I have enjoyed that were very short lived.

Long list.From your bunch:

Farscape
The X files
Spy game - I'd forgotten this one.Haven't seen it since it aired.
Doctor who
Torchwood
The Twilight zone
Firefly
Jake 2.0
Time trax
VR.5

Other favorites

Quantum leap
John Doe
The Adventures of Brisco County jr
The Visitor
Starman the series
Journeyman
The Invisible man (2000)
Nowhere man
Life on Mars (UK version)
Misfits of science
seven days
Alien nation
The Six million dollar man
Now and again
3rd rock from the sun
V the series
Something is out there
War of the worlds the series

i only watch the x-files regularly but I also like all the star treks except discovery.