In short - Monograms or any bag where the print on the leather/fabric on the outside seems more important/obvious than the design KWIM.
1. I agree. I don't like bags with logo prints (especially fabric), so all of these are deal breakers:

That said, I like LV Damier, but it's not really logo, right?
2. Contrast stitching. I just think it makes bags look cheap.


3. Suede. I think it gets dirty too easily and doesn't look good no matter how hard you try to clean it. Even if it's just on some parts of the bag.
Everything else is negotiable.