It would be really nice if you could elaborate and explain your reasons for liking or disliking each type. I used to change my favorite types a lot and I still do, but whatever. Here are some of my favorites types:
1) Most Dark-types have great designs and I like the concept of a type based on 'being evil". Using cheap tricks to win ftw, lol.
2) I am huge nature lover, so it is only natural that I would be a fan of Grass-types. I mostly like the Grass-type starters, but there quite a few non-starters that I like as well.
3) I like this type more conceptually than for the Pokémon themselves.
4) Poison-types very often have nice designs, but I am still waiting for Game Freak buffing the type. They are sort of weak :s
5) Terrific designed Pokémon and an overall very useful type. Love it.
6) Fairy~ The Pokémon of this type are so cute and I am loving them so far.
The others aren't really that interesting to me. Lastly:
18) You see, I don't like the colors blue and white and most Ice-types have these colors in their designs, unfortunately. Plus, Ice-types can't takes hits, they are too frail imo.