If adoption is the most important metric then stick with USD. Monero is essentially where Bitcoin was 7-8 years ago.

There wont be any sort of mass adoption of monero until theres a crisis. Runaway inflation or a 6102 type event.

Which is why people dont think they need monero until they do. 

 Sadly, I fear one of those crisises is on the horizon.  

 Well in the short term anyway,
Bitcoin number go up.

but its well on its way to being a regulatory captured part of the investment landscape.

on a longer timeline monero is where people should be IMO 

 BTC can be useful as a store of value, but monero is best for transactions.