Yeah, the Coronado badge was bought by Whitaker Group (maker of Columbia Yachts) circa '69, and they made the Coronado 27 from '70-'73. The 27 is nearly the same boat as the C-26-2, as posted in that link above.
The Columbia's are sturdy little yachts, but they're classic plastic, with way more emphasis on "Plastic" than something like an Ericson. The interior is all fiberglass, with few attempts made to hide that. The layouts of these small boats is pretty livable, compared to the typical "alley" layout for that size/era, and I think that's the plus of the columbia, although it feels a little "motorboaty" to me. Besides that, all advantages go to the Ericson. I also think the columbias tend to attract less competent owners, on average, than an Ericson, so on average, they might be less well maintained. (Some of the questions and answers you see on the C26-2 listserve are remarkably mis-led.)