I've started tanks wIth tap and with RO. It seems like every tank I've started with tap, the phosphate is harder too remove, and after it is Undetectable in the water, it is still bound to the rocks and I've fought algae like crazy. When I've started with RO, and hit the ground running with gfo, I only had a small amount of diatom algae.
Hauling water is a pain in the a$$. No doubt about that. To me, algae is a BIGGER pain. I would haul 55g on one day instead of scrubbing algae with a tooth brush for months.