While "favorite" is by definition subjective, Hades is objectively the most "polished" rougelike ever released, and from masters of this craft. Absolute gem, highly recommended.
Not technically a roguelike. In any case, it looks really good and polished, though definitely not my cup of tea, there's too much going on on the screen and I've never been a fan of Supergiant Games game design, but that's a totally subjective opinion.