The existence of different methods of moving through the air is indeed neither a proof of evolution nor of creationism. However, creation/design and evolution would have other different observable effects on species and their features:


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Creation / Design Evolution
Species: Separately designed and released on earth by a god or by extraterrestrials. Evolved by inheritance of genetic changes.
Order of appearance: No fixed order for simple and complex species. Simple species precede complex species.
Shared DNA sequences: Only for shared features. In all species, even if they don't share features.
Feature limitations: Features must be consistent with physics. Features must be possible by genetic changes.
Vestigial features: No. Yes if they have no reproduction disadvantage.
Development of features: Optimal initial design. Optimal adaption.
Diseases, aging: No known purpose. Limits lifespan and accelerates evolution.





Most of those differences are observable.