Auto pilot all the way, simply because you can’t add it after the fact, a co-pilot you can add at any time.
Personally I find the Auto pliot issues to be minor every once in awhile they have some issues, I have yet to experince any problems that haven’t been able to be fixed, sometimes it’s a calibration, sometimes it needed a new compass. Even if I had to calibrate it and change compasses yearly, I’d still buy one without hesitation. That being said my last auto pilot was calibrated once, and the compass was replaced once ( early model auto pilot, so I think there made better ones later on) and I owned it and run it a lot in 5 years.
The other thing too, is you can leave the auto pilot off, you don’t ever have to use it, so even if it got out of wack, it won’t ruin you fishing, you just run it like a normal powerdrive. ME? I gotta have my autopilot after running one for 6 years, I found I rely on it to give me the best boat control possible. The co-pilot I love, and use probably 95% of the time, but honestly I can live without it, it just makes boat control a little easier. After spending almost 1400 on my trolling motor, I felt guilty spending another $200 on the co-pilot right away, so I wanted a couple months then my Daughter( Baby was 5 months old so I really mean wife…) bought it for me for father’s day. 
That being said you sound like a heck of a nice wife
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