Assuming dnd 5e, obligatory mention that the caster is not supposed to choose what gets summoned with summoning spells. The caster picks a category (“8 creatures with CR etc etc”), and the GM determines what is summoned (“the GM has the creatures’ statistics”).
What am I missing?
Beastmaster ranger
You magically summon a primal beast, which draws strength from your bond with nature. Choose its stat block: Beast of the Land, Beast of the Sea, or Beast of the Sky. You also determine the kind of animal it is, choosing a kind appropriate for the stat block. Whatever beast you choose, it bears primal markings indicating its supernatural origin.
Druid familiar summon
You gain the service of a familiar, a spirit that takes an animal form you choose: Bat, Cat, Frog, Hawk, Lizard, Octopus, Owl, Rat, Raven, Spider, Weasel, or another Beast that has a Challenge Rating of 0. Appearing in an unoccupied space within range, the familiar has the statistics of the chosen form, though it is a Celestial, Fey, or Fiend (your choice) instead of a Beast. Your familiar acts independently of you, but it obeys your commands.
Summon beast
You call forth a bestial spirit. It manifests in an unoccupied space that you can see within range and uses the Bestial Spirit stat block. When you cast the spell, choose an environment: Air, Land, or Water. The creature resembles an animal of your choice that is native to the chosen environment, which determines certain details in its stat block. The creature disappears when it drops to 0 Hit Points or when the spell ends.
