Movieclips do not use hardware acceleration, so a feature must be added to render the bundle symbols as bitmaps. (Required for optimization.)
You can “export as Bitmap” from the property pannel at the Render section in Adobe Animate.
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cacheAsBitmap is not stable for movie clips from bundle.
when processing a bundle, a feature such as a conversion to bitmap should be added.
flash runs swf much faster than bundles 
It really depends on your usage.
I use Adobe Animate for layout and simple animations and it’s enough.
When I need complex animations, I use Spriter (but I could use also Spine, Dragonbones, or Creatures).