Private for personal use, or you could do public and set the fees really high. If you have public channels with low fees then other nodes will take advantage of them to rebalance their own channels and throw yours all out of balance.
Discussion
I see. Sounds reasonable once more.
How to find out about "average level of fees" though? Amboss or are there other sources?
Amboss has a lot of good info, though I've heard people complain about them being a invasive of privacy if you let them. Might want to ask around about that, I don't remember the details.
Fees are really low, like less than 0.1% in most cases.