Each season I always start the ones that look interesting to me, but by episode 2 or 3 I normally ditch them if they don't hold my interest.
We are about midseason now of Winter 2018. Here are my favourites and the ones I've stuck with and are worth the watch:
The Ancient Magus' Bride (Favourite)
Death March to the Parallel World Rhapsody
Kokkoku: Moment by Moment
Beatless
Citrus
Killing Bites
Katana Maidens
How to Keep a Mummy
Dame x Prince Anime Caravan
Record of Grancrest War