Thats quite a long list
I only have a handful I've ever gotten into, but if I had to pick one, it would be My Little Pony: Friendship is Magic, no doubt about it.
So many things to like about the show, from its colourful and cute 2D animation (something all the more desirable in todays age of 3D cartoons), an extremely expansive list of characters with their own little interesting quirks, interesting lore, great songs, voice talent etc.
It had an impressive run of 222 episodes which I have not managed to fully stomach (only managed to watch about 40% of the show, as well as the movies), but I absolutely intend to watch it fully because its such a well made and fun show.