I had to make the same decision and went for the 94. For me the iSonic 101 felt a lit to close to my iSonic 125. Unfortunately I never had the opportunity to thest the 101, but the 94 is a great board. Works well with 5.7-7.7 range. Board has enough flotation (I'm 92kg) if the wind drops. Easy to gybe and good speed and control. Going upwind is a bit tricky, but I was using a small fin (31 cm) that day.
Don't think you can go wrong with either of them.