I don’t see him going to Philly, that team is not getting any younger. I can see him going for a sign and trade or, if he really sees an exceptional opportunity, signing below market (I imagine most of his income is endorsement based).
That makes the Knicks a tempting target. They have a strong young core that can shoulder the regular season so LeBron can focus on his health. New York is the biggest media market in the country, so his sponsors will love it. If he can bring a championship to a large, long suffering fan base, he will help cement his legacy. I assume that the Lakers would rather take a trade of picks and expiring contracts rather lose him for nothing at all.