Templating forms between protolanguages

Fragment of a discussion from User talk:Rua

I'm curious, what's the difference in effect between using {{m|[LANG]||[TERM]}} versus using {{lang|[LANG]|[TERM]}}? I've been using {{lang}} when I wish to specify the language without creating a link, but I'm happy to change if {{m}} is better somehow.

‑‑ Eiríkr Útlendi │Tala við mig18:18, 16 November 2015