well that would depend on what type of fishing you do or plan on doing, the size boat you have and your current battery setup.
My brother-in-law who is a fanatical crappie fisherman swears the only way to go is rack and pinion or cable steer especially if you do any dipping, easier to make corrections to keep you near the tree when the wind changes directions. Myself most of my experience has been on electric steer models and that is my preference but I have yet to use one to dip trees.
One thing I have heard way to many times to ignore though, get one that has infinitely adjustable speed settings. That way you can dial in the perfect speed for what you are doing. Some of the preset speed models will just not go slow enough.
If you post the type of boat you are using and style of fishing you will be doing I am sure we can get you headed the right direction.
Opinions are like A-holes, everybody has one and some stink worse than others!