Too hard to pick just one card for each category.
Favourites:
1) VTX3D Radeon 7950 - a lovely card, came with a 10% factory overclock (800>880MHz) and the GPU running at just 0.96v under load. Cool, quiet and completely fuss-free. Hugely powerful when new and even today still a good, solid card. And it's probably made me something like 4x the purchase cost in crypto mining over the years.
2) Radeon R9 Nano - my current card and total gem. Small, quiet, low-power and just eats up any game I throw at it. I still find it amazing AMD managed to cram a full-monty Fiji into this little thing and power it from a single connector.
Not So Favourite:
1) Asus reference-model Radeon 290. I bought a pair of these, and oh boy was it a mistake. Loud, hot and generally awful. In Crossfire they sounded like a jet engine and throttled like crazy. And both cards had the black-screen bug and had to go back to Asus for replacement. They sent me a pair of Direct CU II 290s, one of which caught fire from an exploding VRM a couple of months outside the warranty...
2) GeForce FX5900 - 'GeForce' and 'FX', I don't need to say more.