We don't own the original, but we own the Naughtibod which is similar but colored. The Freestyle definitely has stronger vibrations. The difference between the two seems to be a couple things:
A) Both are made from plastic, but the Freestyle's plastic is a very soft and silky Velvet-Cote-type plastic, so it feels really luxurious.
B) The OhMiBod Original is corded. The Freestyle is wireless.
C) The Freestyle has much better sensitivity to vibrations as well as stronger vibrations.
D) The Freestyle comes in better packaging.
I hope that answers your questions about the differences!