I finished standard first for god 1 to 3. I used the standard to unlock the tower so I can start collecting the eggs. As soon as I unlocked the tower lvl, I switch to topaz (you lose everything you gained from the standard). Polishing is more expensive BUT I can start collecting eggs while going through the topaz route of the same god level and collecting the gears needed for that zone. By the time polishing is done, I am also almost done with topaz and is ready to start the next god lvl. It is more expensive (time and materials) but was worth it for me.