Hi Misha
I haven't played either of the Martins you mention. I have played an X series with the HPL composite back and series and, like Daddymack says, it's fine plugged in. Generally though, I'm underwhelmed by Martin guitars - I don't think they play and sound any better than many guitars costing much less.
For a very good, well made guitar that plays and sounds excellent and is very reasonably priced you could do a lot worse than the Crafter TO35. Here is a link to a UK store where you can check it out (it's also available as an electro-acoustic):
https://badlandsguitars.co.uk/products/crafter-t-035
LAG (French company) and Walden also do some very good guitars. UK compnay Tanglewood are always worth a look too. I don't know if these brands are available in Canada but, if so, they are all fine instruments.
But, like Daddymack also say, "try before you buy" if possible.