Creating a good list of relays is more on the subjective side in my opinion. For most, the formula seems to be a handful of big relays along with some niche/paid ones.
You can see a list of the most-used ones here. 🤙
nostr:note1de6jwlplxve3sk64vgcw7grsve7yyrxve8ru3463tktm6qr8a5lsfwk56q