Things that we are looking for:
Commission: 0% means you don't pay any fees. 10% means you lose 10% of your income. This is the main reason to move away from CDC validators. There are plenty of validators that offer the same or better level of service with much lower fees.
Max commission: This is the max level where the commission can be increased in the later months. For long term investment, pick one with low max rate or be prepared to change the validator later. Many start with 0%, but have plans to increase it a lot in the future. Some even have option to change it to 100%.
Self-delegation: More is better. Most people trust more for validators where owner has a decent amount of skin in the game.
Min Self-Delegation: If this is 100k for example, self-delegation can never be less than 100k. Shows that validator is planning to stay for long term.
Missed blocks: It's normal to miss some blocks for update, but if validator is regularly missing blocks at this point when traffic is slow, they will have very hard to keep up later. Could be hardware or network issue.
Ranking: It's good for the mainnet, if all the CROs aren't on the top validators. Currently 71% of the voting power is on top10 validators and 96% on top20. Help the decentralization and delegate to validators on 21st to 90th ranks. Last ten (91-100) have quite high risk to be unbonded, so it's better to avoid them at this point still.