I use the Deeper Start model. My choice was because its my first gadget like that and felt the pro version had a bunch of extra features that I wouldn't really use from the bank. But, I will say that the pro version has an extra accessory that you can attach it to your kayak later down the road if you decide to buy one. I am probably going to try to just pull my start model along side me on a rope when I get my kayak to start with.
The Deeper Start has been a game changer for me though. For example, I have been fishing this area all summer thinking it was around 7 to 8 feet deep and it turns out that the center area is around 18 feet deep and there were a bunch of fish below where I had been fishing this entire time.
If you were closer I would meet up with you and let you use mine for a bit and see what you think of it. But that's a long car ride. ?