Depends. For maximum security, many LSPs only connect to peers that they know and can hold accountable somehow. You might also have a whole network of nodes and want to make sure that you only open internal channels. That's what many Lightning service providers are already doing with their infrastructure.

For users and LSPs that want to keep their network open, choices could be dependent on node age (i.e. open channels with nodes that are at least 6 months old), high availability, channel capacity measures (only nodes with big channels as opposed to many small ones), network ping, Tor availability, etc.