I would choose bitcoin. Because it is easier to get than $
It all depends on the method you use, but I would think that yes, it is possible to make more Bitcoin in an easy way than it is to make dollars. Relative to the amount of work you put in, signature campaigns are massive money makers.
Easy to make bitcoins than dollars or other local currencies. But you can't earn a huge number of bitcoins through signature campaigns to make your living comfortable, but with dollars its possible to make a comfortable living with a day job.