First 2d and Flash are completely different two concepts, as you just said those software, ANI is used to scan color, Toonz useless, but the impression is to make animation footage, Retas is a series of software, the latest version of Retas Studios, is a Japanese animation company used to make traditional two-dimensional animation, divided into 4 parts, Coreretas,paintman,stylos and Traceman, respectively, the role of the composite output, color, paint correction and scanning, in fact, the real common two-dimensional production software you did not mention, that is PS , painter, for drawing backgrounds, combustion,ae for compositing, PR for clip output.
Retas Pro has occupied more than 80% of the Japanese animation industry market share, topped nearly four years of Japanese animation software sales of the crown. Japan has more than 100 animation production companies using Retas Pro, which is more famous for Toei,sunrise,tokyomovie (using Retas PRO produced "Lupin the 3rd Rubin III"), TMS (using Retas Pro made Spider-man Spider Man "), the famous Japanese animation school--yoyogi Animation School and the famous game maker Hudson, Konami also used Retas Pro.
Flash is flash, not a two-dimensional category.
Although you have completely asked the wrong, but I still answer you, according to the two-dimensional animation production process.
First, the shooting is not necessary to use software, if necessary, word enough.
Second, the original painting, animation is no software can be replaced, must be done by hand, which is why the traditional two-dimensional animation duration of the reason.
Third, scanning color software Many, animation is a more common one, but the use of more cumbersome, and has been many years ago the software, there is no vector processing functions, to the color line and the ability to paint, etc. belong to the lower. The Traceman in Japan's Retas series is the best animated scanning software I have ever seen, powerful and simple to operate, but it seems hard to get the Chinese version, let alone pirated, as for the price of genuine software, the full set price of Retas HD series is about 520,000 yen.
Four, synthesis, domestic companies are mostly used AE and combustion, function is not strong, but because too comprehensive, not animation professional, so the use of a certain difficulty, but can play a lot of room. Reats series of Coreretas Although the performance is not so strong, but professional corresponding to animation synthesis, of course, the price ...
As for the rogue Rabbit or something, it is made by flash. That does not belong to two-dimensional animation.
Whether it's flash or retas, even if it's a sequence of pictures made with Photoshop, it belongs to the category of 2D animation,
The difference between flash and Retas is mainly the difference of working way.
The way Retas works is actually close to the traditional hand-drawn process.
and Flash's working way is more arbitrary, but no matter what tool, in fact, can make high-quality animation.
Hard to say who is the most suitable for animation, then, I can only say that Retas draw line scan lines and the ability to color is flash, if the flash is a small child in the hands of playing mud, then Retas is the master of the professional level of the clay.