There is barely a comparison to be made. Lua is faster, LuaJIT is much faster, lua is much easier to embed and lua is much more elegant and way less awkward to

There is barely a comparison to be made. Lua is faster, LuaJIT is much faster, lua is much easier to embed and lua is much more elegant and way less awkward to program in. TCL ends up being funky and lua ends up working. When there was no competition in the space of already made scripting languages that were easy to embed (except for possibly perl) TCL had a place, but it is a relic of the past now and for good reason.