Tokyo Loop

Both are anthology collections showcasing a bunch of short experimental animations about various themes. Watch those if you're interested in artsy experimental anime, anthologies, or both. 

Anthologies of various short anime made by different people with different animation techniques. Those shorts have unusual feel and not style that you would usually expect from anime. 

Both are collection of short stories, which are more like story-less videos with background music and random animation. Both can be trippy but enjoyable. 

Both have short episode(s) consisting mostly of random animation and no story, but can still be enjoyable to watch. While Dimension Loop is more sci-fi, Tokyo Loop is more comedy. 

Both are collection of short experimental movies each done by different person with different style of animation. Both can be a bit trippy sometimes. Both have comedy parts. 

Both are collections of short stories made by various artists each with different animation. While Tokyo Loop shorts have no connection, Fuyu no Hi shorts are based on renga by japanese poet of 17th century. 

Both are collection of short, sometime a bit trippy stories, independent on each other, each with different animation and story made by different people.