You're right, Fox CAN be pushed to do awesome stuff, and those are the combos I really enjoy. I like to see lots of variety in move usage, as well as slick movement and tech skill. I prefer combos to be extravagantly showy with lots of pivots and difficult movements.
That's one of the reasons I like Ricky's combos so much. He does technical stuff just for the sake of showing off what he can do. An example is finishing a Link combo with a FF U-air, as opposed to a standard Fair. I love to see that stuff, and pretty much any combo is entertaining to me if you do a lot of subtle technical jazz.
Regarding Samus, being able to combo in general with her pretty much requires extreme technical skill
![Awesome :awesome: :awesome:](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
so those are always entertaining to watch. e.g. Ricky's latest Samus combo had a FF aerial, teleport, and a couple ledge cancels. That's pretty technical and falls under the "cool ****" category, earning my seal of approval!