When comparing tcsh (shell) vs mksh (MirBSD Korn Shell), the Slant community recommends mksh (MirBSD Korn Shell) for most people. In the question“What are the best UNIX shells?” mksh (MirBSD Korn Shell) is ranked 9th while tcsh (shell) is ranked 10th. The most important reason people chose mksh (MirBSD Korn Shell) is:
mksh is very light on resources it needs to use and as a result it's quite fast. It also gets better results consistently than other alternatives when comparing benchmarks.
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Pros
Pro C-like shell
It's a C-like shell with tenex command-completion feature, which is very convenient.
Pro Organized documentation
All the documentation that's needed to use tcsh is located in man tcsh
instead of being spread on various helper programs.
Pro Very fast
mksh is very light on resources it needs to use and as a result it's quite fast. It also gets better results consistently than other alternatives when comparing benchmarks.
Cons
Con Limited support online
The support and number of guides and tutorials is rather limited for tcsh online because there are not many people who use it. At least compared to some of the other more popular alternatives.
Con Development is pretty slow
Mksh is part of MirBSD which is barely even being developed anymore nowadays.