It all depends on what is a
priority for you(in my opinion).
Either option you stated would work, but you can
get more done, if you don't waste the whole EMH standing in a line for RSR--
unless that is your number one goal--then obviously, it wouldn't have been a waste for you, personally.
I think what many prefer to do, is jump in the
single rider line(if that works for your group--you must be at least 7 years of age to to this),
wait to ride RSR all together(can happen if you are successful with"wide right"),
or go do other things, and just make sure you are back to get in the fast pass line
before DCA opens to everyone else.
We've done it both ways, and been happy with the results, but we
planned to do what actually happened.