Debatable but IMO Lightning is still nascent even to this day. There is no real large ecosystem of interactive web applications available in-browser that you can build 402 offerings on top of. The EVM is light years ahead.

I'm by no means against Lightning, it's just got a long road of ecosystem, development and better UX ahead of it before we see general mainstream adoption. At the moment, bitcoin's killer feature is holding bitcoin. Most people don't know what Sats are. There are few bitcoin-payable apps. Few stable assets that remove volatility for every day payments like you would need with 402. Stuff like that.

It is a bit unfair to say you cannot build any x402 offerings on top of lightning, when the very same driving force behind x402 (=Coinbase) didn't design it to, but instead pushes it's very own corporate technology into the standard (Base). There is no technical limitation in lightning that wouldn't allow it to be integrated into a standard - if you design that standard accordingly.