The worst part about Lemmy is having to scroll past the same article dozens of times when browsing All.
How do I prevent this? Whenever an article gets popular it gets posted to the news community of every single instance so you have to scroll by it several times a day for a week. Is there a "prevent duplicates" option in any of the clients? I'm pretty close to abandoning lemmy honestly. There's very little content that isn't "memes for teenagers" or "the same news you saw yesterday".
My favorite is Thunder. But then I'm probably biased considering I'm on the dev team.
Cross-post de-duplication will come eventually, but right now, the dart API library (also used by liftoff) doesn't have cross post related stuff implemented yet.
Having used both, Sync is better. Liftoff felt light years behind Sync. I will also note as a purely anecdotal, I saw more duplicates on Liftoff than I do now on Sync... I still see a lot of duplicates but not nearly as much as before... Grabbed, I was using Liftoff when the Reddit migration was occurring so that could be the reason I dare more duplication with it.
Don't use liftoff. It hasn't been updated in over a month despite being pretty incomplete and still lacks the ability to display some really basic features like spoilers or superscript.