Start with the room and guest count. A mirror or open-air setup suits most indoor venues because it keeps the footprint compact while still giving you a strong visual focal point.
Pick the output your guests will care about most. Printed strips feel instantly tangible, while GIF, boomerang, and 360 formats work better when the audience wants to share on their phones straight away.
If the event is formal, lean toward glam, mirror, or studio-led options. If it is loud, active, and full of movement, 360 or open-air keeps the queue moving without losing the fun.