I was wondering when this would come up.

Personally I'm a fan of the older, "original" NFTs. Basically anything with a birthday in 2017, as collectibles usually gain value with age.

Examples:

- Cryptopunks: June 2017. Arguably one of the first NFTs (ERC-20);
- Cryptokitties: Nov 2017. Founder cats are especially rare and collectible (the first 100 cats). CKs were the first ERC-721s.
- Decentraland: Dec 2017.

I also own:

- Autoglyphs: Although they were created in 2019, they are the first NFT with "on-chain" art, though the definition is subjective and up for debate.
- Crypto-stamps: well-known to these forums, already.
- Cryptovoxels: May 2018. Similar in concept to Decentraland (decentralized land ownership in NFT form).