If you want to have both Bitcoin and Ethereum in one wallet, you can use Exodus.  
If you click on each of transactions, two prices are displayed. One of them is the current price and another one is the price on the date of transaction.

Note that Exodus is not open-source. Although, I haven't heard any complaint about its security, I don't recommend it for storing large amounts.
(Exodus give you the private key. But we don't know if they have access to our private keys.)

Some other users of the forum may come with better suggestions.

No need.