Jumpstyle can refer to either the music or the actual dance, while Shuffle is a dance (the Melbourne Shuffle) which is usually done to Hardstlye (Hardstyle Trance) music.
Shuffle requires more rhythm. Jumpstyle requires more flexibility. The actual kicking in Jumpstyle is always to the actual kick, while in Hardstyle, the step is on the beat while the arch in the knee is every half beat (where the reverse bass comes in)
Shuffle is always going to win.