I'd have to pick the Adams. They seem far more passionate to me and Morticia comes across as a much stronger and independent woman and the pair come across, to me at least, as equal partners in the relationship. It's them against the world.
Lucy and Ricky are generally at odds with her wanting to make her own money or be in his show, while he wants her to stay at home and be a housewife. Most of the plots in I Love Lucy is one against the other in some way rather than them against the world.
Bear in mind I haven't watched either in a long time so correct me if I'm wrong.