On the other hand Dogecoin has better liquidity than BTC, so actually works better as a currency instead of speculation vehicle.

That depends what you mean by "works better as a currency." Considering you need two parties for what I would consider a useful application of currency, I'd say Bitcoin works better.

What do you mean when you say "liquidity", and why do you think Dogecoin has more of it?

Right, so chances are dogecoin is and will remain lower-valued than bitcoin in the aggregate. That's relevant how? Surely multiple virtual currency bubbles can exist concurrently.