FYI on modern LaTeX engines like LuaLaTeX (and also XeLaTeX) Latin Modern actually is the default.
But Latin Modern and the default Type 1 version of Computer Modern have exactly the same thickness, so if Computer Modern looks thinner for you then it must be some weird screen effect. (The hinting is a bit different, but I wouldn't have expected that to have a significant effect on current systems where hinting is often ignored anyway.)
But Latin Modern and the default Type 1 version of Computer Modern have exactly the same thickness, so if Computer Modern looks thinner for you then it must be some weird screen effect. (The hinting is a bit different, but I wouldn't have expected that to have a significant effect on current systems where hinting is often ignored anyway.)