I have no pref either, if you're good, you're good.....or vice-versa.
I agree.
Seeing we are talking about flight directors, did you ever fly a straight Citation 500, one of the early ones?
That had to be the easiest FD I have ever flown. Hell, you could take a 10 year old that was a good video game player, put them in the left seat of a Citation 500, have them shoot an ILS while you sat in the right seat to handle the power and I'd bet a beer the kid would be able to fly it down to minimums.
But I understand that the FDs in the early Citation 500s were a maintenance nightmare and that is why there are few if any left.