LN leaks payment amounts to third party nodes along a route.

Monero completely hides the amount you're sending to your counter party from all nodes on the network - even if you're using someone elses node.

LN privacy sounds great in theory, but no one uses it like that, it's moot when 95% of users are on things like Strike or Wallet of Satoshi that can see everything their users are doing (because the bar to achieve good privacy on LN is higher than Monero)