This is hard... As a Wado-Ryu Black Belt 3rd dan, I love advanced Katas such as Kushanku, Chinto, Bassai Dai, Sochin and Hangetsu, but you cant beat a spot Of Pinan Yondan or another Pinan Kata. My fave Pinan Kata is Yondan, and Shodan is great too. Otherwise, Kushanku, Bassai Dai and Sochin.