Flash was never a primary animation program to say, and so a lot of it is seriously tedious. TB was built up by animators for animators.

The brush/pencil tool in TB alone is miles superior. it draws clean lines like in SAI, instead of the jagged miss that flash does.

You can rotate the stage in any way you want to draw from any angle in TB, in flash you are stuck with the default view and can’t rotate.

gif pink with white background: flash, 2nd pink shift with grey: TB

Here’s an example:

Hand is above body on frame 1, and you want on frame 2 for it to go behind body, and then on frame 3 to go back to above.

In flash:

You have to copy the layer keyframe, then make a new layer, that is behind the body, paste it there, animate, and then move that keyframe back adding to uneeded layers and complexityh.

TB: everything is 3d space based. Frame two you just shift that hand layer via z depth .001 back and now its behind the body layer (similary you can move it above/behind any other layer in a similar frame within that keyframe). No extra layer is made, and everything stays in the place of how it was built.

On top of that it has patching, cutter, deformation, nesting rigging, auto thumbnail drawing replacement, etc. The list goes on and on!