Had to vote PDS. Virtual On is good, but you need to buy the overly expensive twin sticks to fully enjoy it. Shining Force 3 felt too linear. Sonic Jam isn't realy all that much more then a compilation of non-saturn games. And Nights, while very good and unique in its own right, left much to be desired after xmas nights with its presents feature, and supperior interface.
In other words, no contest.