Why Ethereum over other smart contract tokens?

I've been invested in Ethereum on and off since '17, but now I think it's time I learn the technology well.

One of my biggest questions is why we are still using ethereum as the go to smart contract token over other tokens with WAY cheaper gas fees. Is the security on Ethereum that good that nothing else competes with it?

I've read about L2 rollups and how they will help reduce fees by packaging tons of transactions up and processessing them all at once rather than individually (if I read correctly). Will the other ETH competitors like Solana end up coming to the same high gas fees when they become more busy just like ETH?

Any links to good, unbiased articles would be appreciated if anyone has any. Most YouTube videos just have the content creators shilling their preferred coin.

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Thank you!