Specs of an Ericson 27'
ERICSON 27 sailboat on sailboatdata.com
Specs of my Tartan 27'
TARTAN 27 sailboat on sailboatdata.com
Specs of a Catalina 27'
CATALINA 27 sailboat on sailboatdata.com
These three boats displace about the same amount of weight/water. The nearly full keel of the Tartan allows it to track nicely, even in some sloppy conditions but the full keel make it a bit slower to come about when compared to the other fin keel models with spade rudders.
The fin keel and spade rudders probably make them a bit more prone to "quick motions in a seaway" as reed1v mentions. I'm not an expert so it would be nice to hear from Jeff_H on this one.
SloopJonB is also correct that every boat owner finds some way to extol the virtues of their own model. I really like my old classic plastic Tartan 27' - proof enough. If I owned a Catalina or Hunter I'd probably feel the same way.