Chinese IMEs - Wubi, Cangjie
Wubi is indeed very fast, but the cost and benefit makes it less worthwhile. In fact, I'd like to argue most of the professional typewriting systems aren't worth learning. You get AI support on major sound-based IMEs and AI advances a thousand miles a day, soon they will be at least as fast as Wubi and its peers. I'd like to think Wubi is as dead as all those stenotype systems. You shouldn't use them if you want to be some sort of professional.

Also Wubi is a copyrighted system, though the copyright owner, 王江民, reluctantly gave out an earlier version for free (after losing a copyright lawsuit, which is kind of ridiculous because he should have won), the later versions are again copyrighted. No software company takes interest in buying the copyright and develop an IME for it, which means you're stuck with the so-called classic version which only supports a subset of simplified Chinese characters(it can support a bigger charset, but you have to work around a lot of issues, making it less of a choice for traditional Chinese). 王江民 made IMEs with his own company, but apparently he knew neither software nor business. Last time I checked, the company had only 2 part-time employees maintaining the website, nothing else. 

The business is later transferred to 王's daughter-in-law, but she has her own business to take care of. Last year I wrote a tirade on the status of Wubi. She said she will do something about it, but nothing happened since then.

By comparison, the Cangjie inventor had made it to the public domain, and now it has a livelier ecosystem.

In general, Wubi takes less strokes to form a character, but Wubi's rule has more exceptions and therefore more difficult to learn.