Yes and no. If you learn only the 4 easiest cases and they never show up, like many CFOP users unfortunitly do, it seems like wasted effort.
If you are going to learn either, stick with it.
Someone did the math and practically with current algorithms, COLL/EPLL is four moves more than OLL/PLL. If you need to do 6-11 extra moves to do EO, well, you can do the math.
I know full COLL and I love it, but I am in the minority here.