The starter vs maintenance fertilizer choice depends mostly on how old your plant's roots are. A seedling has a tiny root system that reaches only a small patch of soil.
Container vs ground fertilizer decisions start with how much soil surrounds your plant's roots. A pot holds a small pocket of mix that loses food every time you water.
Houseplant products often come as liquids, tablets, or small granules sized for pots. Outdoor products use bigger granules, since open soil can absorb and buffer extra nutrients.