Water ballast in a trailerable boat is solely for weight reduction when trailing.
A new H260 is certainly more expensive than a Mac, but I find it hard to imagine the Mac having more interior room. My H26 (older version of the 260) has 5''7" headroom, which to my knowledge is the most in any trailerable boat. I know people with Mac''s, though not the 26x, that go ga-ga when they see the inside of my boat. One, with a 25, won''t even let his wife see mine, cause he knows she''ll want one.
The Catalina, while similar in layout, does have less headroom. Though both the Hunter and Catalina have "poptops" for increased headroom at dock or anchor.
If you want a sailboat, get the Hunter or Catalina. The only redeeming aspect of the Mac, IMHO, is it''s cost. Though, I will say, any boat is better than no boat