Bloodthirsty is no longer impressive IMO since a lot of people spent days doing AV/IoC HK premades to get those titles, back when Preform AV Enabler was a thing.
I usually find titles that were removed the most prestigious - it shows that you've been around a while. I've been sporting my Champion of Ulduar for a while now, even though it was fairly easy to get it back in the day (because the achievement was completable over multiple lockouts, unlike Immortal/Undying). I love Immortal/Undying but I don't like them on my main.