All hearsay of course, I haven’t driven either and likely wouldn’t unless I went and ordered one or had a super awesome rich friend who would let me drive theirs. (Hint hint nudge nudge)
That would be disappointing because from all appearances, Singers are immaculate. But if they don't let anyone say anything negative about them, then it will always appear that way. I have a hard time believing they aren't amazing regardless, but for the money people have the right to be extremely picky. Seems like you see the Guntherwerks as the workhorse of the two, which is great if you intend to drive it a lot. I know I would!