Delegators are free to choose the validators based on their own preference. Here are some indicators that you can take for reference.
Amount of self-delegated tokens: Validators with a high number of self-delegated $FX will be a fairly good gauge as it shows their commitment to operate the node.
Commission rate: Commission applied by validators before it is distributed to their delegators.
Track record: You can look at the track record of the validators you plan to delegate to. As all the validators in the f(x)Core will be new, all validators will have a chance to establish their track record.
For starters, the validators will consist of company-hosted validators. These validators can start with a minimum amount of fees, which means that token holders that delegate to these validators can earn the maximum reward possible. Also, for security reasons, we would like to secure the network together with the community so that your $FX are not at risk with the public validators.
Stay tuned for public hosted validator to come soon.