Bitcoin is a store of value, with a fixed mechanism. The concept of blockchain was invented for Bitcoin. Yes, many people found other uses of the blockchain tech, but its original purpose was to run the Bitcoin network.

Ethereum on the other hand is a programmable blockchain. The pitfalls of a programmable blockchain are so humungous, that its almost certain that the system will be hacked at some point in the future. A hack will not kill Eth, but it would make some serious dents.

I am not claiming that Bitcoin is un-hackable. But the chances of Bitcoin getting hacked are miniscule vs Eth. Wearing the investor's hat, I'd put my money in Bitcoin.