Should BIP39 passphrases include the use of spaces?

Numerous sources advise using a random combination of words to structure a good BIP 39 passphrase. (e.g. EFF dice passphrase generation: https://www.eff.org/dice).

These sources do not mention whether or not spaces should be used, between the words.

I'm not sure the extent to which spaces may or may not make a difference, from the perspective of a brute force attempt on the passphrase.

Is there any good rationale for or against the use of spaces?