I think unit value has a certain validity for any currency, even when comparing to a competing economy's unit value. Certainly, market cap is a better overall indication, but most people understand the unit value first and the market cap later.
Well I'm sry I did not make a screenshot when DASH/btc was in excess of ETH/btc...
And Of Course it's not a valid comparison... especially when DASH is inherently more useful.
By Golly it was a gleeful moment to see it onscreen at Poloniex, though !