Bitcoins roadmap is for scaling pretty much 100% off chain.
Transaction bundling, or "caching" as they call it, is technically on-chain.
Ethereums roadmap is for scaling on chain. With 100's and then 1000's of TPS + statetree pruning there is much more promise of on chain scaling in Ethereum than bitcoin.
We all know this is bullshit. Any recursive, closed entropy system like proof of stake is a permissioned ledger in the first place, not a decentralized currency or network. Then each attempt at doing a partition will create further permissioned ledgers, isolated from one another without interoperability. In the end, it's like a centralized company like Amazon offering instances of a VM, except Eth will have a million times more overhead to do the same thing. There's no reason for such a system to exist. It's a dysfunctional Rube Goldberg machine designed to try and make money from people who can't figure out how it works.