My collections for art are my favorite. I may collect other things, but my Arita collection, and my MtG Land collection are definitely the prime parts of my collection hoard.
My main collection is my grimer and muk collection that includes both tcg and non tcg, all official tcg cards in english and japanese are already done but the non tcg side is a life long journey where things to find will never end. Besides that i have my basically completed wotc and topps collections and almost finished Komiya artist collection and the numerous side collections, both finished ones and some still ongoing.