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An L2 would prioritize using Ethereum over other DA options because Ethereum offers stronger security, ensuring users can safely withdraw their assets back to the main chain in case of an emergency.
Alternative data availability layers provide L2s with more cost-effective and efficient DA options.
The following L2s use Ethereum for data availability:
- Taiko
- World Chain
- Scroll
In contrast, Mantle uses its own custom DA solution, MantleDA.
Learn more here: https://l2beat.com/scaling/data-availability
A validium, similar to a zk-rollup, uses validity proofs and relies on Ethereum as the settlement layer. However, it differs by utilizing an off-chain data availability layer instead of storing data on Ethereum.