You'll probably get as many different responses as there are posters on this forum, but I'll say:
1) As of right now, anything you can get your hands on. There's a serious ammo shortage right now, and .22LR can be very hard to find or significantly more expensive than it should be.
2) If you're accuracy minded, its usually best to avoid higher velocity. Standard velocity is typically best for accuracy.
3) I always avoid copper coatings on bullets, as they do nothing for me performance wise, and are harder to clean up after when you've shot a few thousand rounds.
My generic best starting point is CCI Standard Velocity. Its quite accurate in most .22s, and usually pretty inexpensive (right now, that's not likely the case if your supply market is anything like it is here in the USA.)