In fairness, both of these standards are from & for the cryptobro universe. Just that x402 is supported by large corps & l402 is created by some arbitrary shady crypto startup nobody has heard of.

It's even possible that x402 directly took ideas from l402 given l402 seems to be a few months older, but x402 has over 1000 contributions from almost 100 contributors & l402 seems to be solo project without any updates this year. It's not a moral preference, just a practical one.