Each pool has a different purpose, reward policy and slashing rules. Slashing means that the stakers can lose some of their ADX tokens if the validators misbehaves (e.g. goes offline and therefore stalls campaigns).
Currently the recommended pool “Validator Tom” does not have slashing.
In addition to this, staking bonds are locked for a certain period of time so in a case of an unexpected market movement, you may not be able to pull your tokens and react quickly.
You should also be aware that staking happens via a smart contract, and every smart contract comes with a certain level of risk as well. In order to mitigate this risk, we conduct extensive reviews and audits of the smart contracts we use.