Definitely the bottom for me. All I care about is that it runs, can run whatever I want it to, and for games has more of a stable framerate. Looks definitely come second to functionality, if you ask me.
This is me as well. I grew up when PCs were just a beige box, utterly boring and uninspiring. The cool thing happened on the screen! My GPU has some LEDs and stuff but I only got it because it was cheaper than one without, and I still have a case without a window so whatever