How to choose
Match the tool to the artefact. Presentations and brand consistent documents need a template and a brand system, not a better image model. Standalone images need aesthetic quality. Short form video needs speed and captions more than it needs generation.
Check the content licence before client work
This is the outcome where terms differ most sharply. Some products claim broad licences over what you upload, and some make your generations visible to others by default unless you pay for a higher tier.
For personal work that is usually fine. For work under a confidentiality agreement it is a real constraint, and it is worth reading before you commit rather than after.