It may be that Factor could do a better job advertising
True. After all, transliterating the Factor example to Haskell looks something like
module Main where
import System.IO (putStrLn)
hello :: IO ()
hello = putStrLn "Hello world"
main = hello
Of course, in Haskell you would just write
module Main where
main = putStrLn "Hello world"
My point here is that the Factor code doesn't do any real magic. When you give it a chance, the syntax is quite powerful.
It's really neither here nor there: picking a language and getting at least somewhat comfortable with it is going to be better than endlessly deliberating. They all have their merits (even bad languages!).
