C&B,

Back to your question... The main difference is the cost. The Scotty will run you about $300 and the Pro Troll in under $100. Another difference is the contact sleeves. The Scotty has stainless tubes flared on the end whereas, the Pro Troll model has coil types. This are not very idea. As a matter fact and I heard of a couple problems with the coil sleeves causing the wire to fray or kink. You can always order the stainles tubes from Scotty and transfer them over.

Another difference will be the Scotty model has a pulse mode which changes the current from natural voltage to induced voltage in 10 second increments..

Last but not least, is the shape. The Pro Troll model is square in shape and smaller. They mount on the dash. The Scotty model is cylinder shaped and can be mounted in the dash (or on it)