At least according to AllSides, while The Guardian leans left a bit more than Reason leans right, it's not too much different. Guardian[1] has -2.4 out of -6, while Reason[2] is 1.8 out of +6.
From what articles I've seen from Reason, they seemed to clearly lean right to me, that's why your comment came across as odd, albeit technically correct (it is slightly closer to center than the Guardian). Your comment suggested to me that they are a lot more in the middle than that, though.
Technically correct is the best kind of correct! Anyway, it sort of depends on the definition of "left" and "right"; not sure how allsides.com defines them. Reason seems to be "libertarian", which is a mix of positions one might call [maybe even rather far-]left and [rather far-]right, and one might perhaps say that "the average" of these positions (if you could take a scalar average in a vector space, which of course what allsides.com does by necessity and so are we in this conversation) is "center." The Guardian is seemingly "left" in most ways according to typical current definitions.
Political opinion is a phase space with so many dimensions we're really on a hiding to nothing even discussing it. (And for added complexity, that link I gave was to Comment Is Free).
From what articles I've seen from Reason, they seemed to clearly lean right to me, that's why your comment came across as odd, albeit technically correct (it is slightly closer to center than the Guardian). Your comment suggested to me that they are a lot more in the middle than that, though.
[1]: https://www.allsides.com/news-source/guardian
[2]: https://www.allsides.com/news-source/reason