I’ve tried all of these eartips (I specified large size because if they work with the case, the smaller versions will too):
Spinfit 360 Larges–they fit the buds and the case–I didn’t care much for the sound unless I barely put the tips into my ears. They have a good grip, but the best seal for my ears with these earbuds involved NOT putting them all the way into my ears. If I put them in too far, they sound tinny (rather than the other way around). Fantastic bass response, but they lack some fullness and the buds stick far out of my ears. Your mileage may vary.
Comply TW-200-A Larges–they fit the buds and the case…and take out some of the excess highs of the signature EQ—which I like. I can insert the buds all the way in that give them a flat profile. I can almost side-sleep with these in. Disadvantage is that they’re $25 per 3-pack and don’t last nearly as long as silicone tips. For me, it’s worth it. For others, this is something to consider.
Sony WF-1000-XM4 Hybrid foam tips–Large–they fit the buds and the case–and take away some of the highs, but don’t sound as good as the Complys. These are $5 PER TIP, though. If you wanted 3 sets like the Comply tips, you would need to spend $30 plus shipping from Sony. If interested in trying these, I can try to find the link again for them.
Out of all of them, I go to the Comply. To me, it’s like the Complys and the Soundcore Liberty 3 Pros are made for each other. It’s made the sound so much better!
I hope this helps.