Hold or giveaway. Don't sell what you would have to buy back later.
Giveaways are a good option for when you aren't sure, as it feels really good & positive ---then if you want that villager later, it won't feel as bad as selling your best friend.
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Yeah (unless you run a cycle town?) if you formed a bond with them from your main town & you weren't just cycling, selling them won't feel good.
Then they will go to the highest bidder rather than being passed onto someone who has them as a dreamie and won't be re-selling them or not give them a nice home.
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just make sure the people you giveaway to are the real deal & don't have a habit of selling dreamies in their own cycle town.