I really like Gekisai Dai, as we do it in Seido. The way everything is combined, strong techniques followed by the explosiveness at some parts.
Also I really like Seido katas (as the name suggests, unique to Seido karate). It focusses a lot on hip movement, throwing powerfull cross punches, and also moving backwards.
Ichi Nichi Issho - one day, one lifetime