I like very large, high G planets because they tend to be flatter and the G's keep you nailed down. This makes it easier to travel at high speeds, which can be a boon when you're just trying to get Metallic Meteorites to spawn. Or because it's fun to go recklessly fast.
I also like very low G potato planets. On these I work on hopping, trying to get good height and maximum air-time out of every bump, all while watching the scanner.
Which of those I prefer depends entirely upon my mood.
Anyhow, I'm not a big fan of the in-between stuff. If I've got to be careful of my speed but I can't get good hang time? Lame. Also: small, bumpy worlds that manage to have high G are really awful.
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and if you're really unlucky you'll notice it for the first time on the HUD as you drop out of orbital cruise and wonder where the boost button is.
Lucky for me, that display's lettering is too small for my eyesight, so I never have to worry about discovering the G by noticing it on the HUD!