They all require hydraulic steering since they use a pump. I don't think they make APs that work with manual steering anymore. I had a King unit back in the day that used an electric motor that fit under the steering wheel.
I have a Furuno Nav Pilot 300 like Trapper's. It works very well and is robustly built. It makes the other outboard APs look like toys. The remote with the gesture feature is very convenient for dodging crab traps and other boats. It has a sabiki mode that is supposed to hold the boat a fixed position with the engine in reverse. I find that this is only useful on the rare days where the wind and current are coming from the same direction. The flux gate magnetic compass is good, but it is not fully water proof and needs to be mounted in a protected location.
I use mine with a Simrad NSS Evo3. Like all the other APs, it is recognized as another NMMA 2000 device by the MFD. The point being that they all work with any NMMA 2000 compatible MFD. Integration with the native software is really not as important as you might think. If I had a Simrad AP, I would be able to go directly to the AP steering function by tapping a waypoint on a chart twice. But with the Furuno, after selecting the way point on the chart, I just have to press a button on the control unit or the remote to start the steering function. So no big deal.
If you have at SImrad or Lowrance MFD, there is some advantage to using the more expensive satellite compass. I was on a boat with one of these and they are really fast and accurate. They are also water proof and can be mounted in an exposed location like on a T-top.