Good for both. There are some rly good videos out there about how he can help deal w thorns and limbo that might help if you don't already have champs for those specific things.
His block penetration is rly nice as well.
Yondu is really good as defender! Also very strong as attacker imho! However, if you fight him with a duped DD, he's pretty easy but for the rest it's tricky. Place him on enhanced bleed node
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His block penetration is rly nice as well.