Not only our preferences, a decision may depend on what is available to us.
Often, starter/grower is what is available at the feed store. Perhaps, there are separate products: starter and grower. You may even have starter, grower, and finisher (or developer).
Flock Raiser is what I fed after the pullets reached 8 weeks. Purina says this, "Purina Mills Flock Raiser is a 20% protein product made from the same high-quality ingredients as Start & Grow."
I should say that my pullets always start on the feed that they were on when I purchased them. Since, the local feed mill has its own starter, I stay with that until they are 8 weeks plus.
Steve