I don’t think I have an all out favorite. Always liked Niven. Pournelle.
Pournelle and Niven are great(Mote,Ringworld(I think that is just Niven),legacy of Hereot are my favs), but for me it is Jack Vance and Gene Wolfe and then everyone else.
Pournelle on Vance, from the blurb on the back of “Throy”: “You can’t possibly pass up any book by Jack Vance...He has perfected the trick of creating new worlds so deceptively real that after a while your own home seems imaginary.”
Freegards