Selling them might get them into the hands of someone with an interest in audio, which is always a plus if they had meaning to you. Giving them away to someone here should also result in them going to someone with an interest in audio. Donating them would likely result with them being sold for peanuts to a bargain hunter who may or may not have an audio interest. It all depends on a given recipient.
An Agon member was offering up a free pair of Thiel speakers when I first joined. Due to my unfamiliarity with the messaging system here, I missed out, but would have loved to pick them up for my youngest daughter who’s a singer and music teacher....guess it wasn’t meant to be, but I thought the gesture of offering them was very cool. 😎