My opinion is that unless you are crossing oceans a Raymarine EV-100 is all you need. Cheap, DIY installation, works for all motoring and sailing up to 15 knots or big waves).
You won't need more batteries or a solar farm for day sailing because the draw is 2 amps/hour under usual conditions, and when motoring the draw is irrelevant.
Pendulum wind vanes are marvelous expensive things but make no sense at all unless heading offshore. They need to be reset after every course change, require specific sail plans, and don't work at all when motoring in no wind.
If you can set up the boat on any course for minimal steering correction, the EV-100 will have no problem with a loaded E38. It is easy to make the test: go sailing and feel the helm. IN typical conditions, if the boat won;t go in a straight line without actual work wrestling the wheel, a wheel pilot will be overwhelmed and shut itself off).
But what happens if you put in a reef and reduce the genny a little? If the helm becomes easy, the wheel pilot can take over again.
Think of them as a talented 8-year-old pram sailor. Sure, when the wind comes she calls for help. But most of them it leaves dad free to do other stuff.
If the kid squeaks, pour fresh water into the hole in the drive belt housing, which is what it's there for. Salt crystals are the culprit.
This rather clumsy video shows me making all the mistakes possible with a new Ray wheel pilot five years ago. Mostly that was ignoring sail trim and failing to provide a fairly neutral helm.
https://www.youtube.com/watch?v=0eP6iVFniHM