I am a fan of both but Trek has always been far more important to me.
Mandalorian has hit a homerun for me with regards to Star Wars. Almost erasing the pain of the last two movies in the recent trilogy.
Recent Trek, including Lower Decks, have not had the same impact for me when watching. I think with Mandalorian the special effects are better, the stories are better (even if more simple) the editing/pacing is better, the music and costumes better and even the acting. I haven't seen a home run out of a Trek show since Season 4 of Enterprise with "In a mirror darkly".
I think that recent Trek has suffered mostly from poor writing, and the changes behind the scenes with different show runners and such. Discovery has improved in season three in my view and that bodes well for the next seasons but it hasn't blown me away even once. Mandalorian HAS, and on more than one occasion.