Great question!

I think Ethereum will have a hard time scaling. Since the state is all on-chain, it'll be increasingly difficult to scale over time. Not to mention that all the scaling solutions all have their own token, and don't interoperate with each other well.

Also, there seems to be increasing centralization concerns now that Ethereum is PoS.

The surface area of attack for Ethereum smart contracts will never be a problem for Bitcoin, since DLCs on-chain are simply a 2-of-2 multisig, so the surface area of attack is minuscule.

DLCs can scale using DLC Channels (basically a lightning channel for DLCs).

When we ask ourselves the question of what's going to be around in 20 to 30 years, I feel really confident in Bitcoin. Ethereum not so much.

We also wrote a blog post containing more of our reasoning as well: https://atomic.finance/blog/an-atomic-pivot/