Too long; didn't read >>> Compare your crypto currency value to a single fiat currency, whichever fiat is your domestic currency.

The best approach is to compare your investment - ETH - to a currency that has a relatively stable value - USD, GBP, EUR, YEN. This will ensure that the investment price is being compared to a stable baseline each morning or night when you check in on the latest price or activity for the day.

When you compare the price of ETH to BTC you're comparing the value of two wildly volatile investments to each other, which makes the day to day comparisons of the price of ETH harder to understand, because it it requires you also normalize for the movements of BTC in the same day.