The .io in your list is worth separating out because ccTLDs are not covered by UDRP as a class — each registry sets its own dispute policy, and they range from a near-copy of UDRP to essentially nothing.
That's the actual lever available to you and it isn't the registrar at all, it's the extension. Choosing a ccTLD whose registry has a weak or non-existent dispute process does more for you than any registrar could, and it's free at registration time. The trade is that a small registry can also be arbitrary in the other direction with no appeal, and a handful have simply deleted names on a phone call from someone local.
On the registrars themselves, ranked by what actually varies:
| Registrar |
Who is registrant |
Forwards or actions |
Notes |
| Njalla |
Njalla |
Forwards to you |
Hardest to transfer out, by design |
| 1984 |
You |
Forwards |
Iceland, conventional ownership |
| OrangeWebsite |
You |
Forwards |
Similar posture, older brand |
| Virtualine |
You |
Unknown to me |
No reports either way on record |
"Unknown to me" is not a criticism, it's the state of the evidence, and I'd rather leave the cell honest than fill it.
I have never had a trademark complaint reach any name I hold, so all of the above is mechanism rather than experience.
Short version: pick the extension for the dispute policy and the registrar for whether they tell you before they act.