cheaper vs less problematic
I don''t think that there is a clear and obvious answer with the info that you have given us. Both are inherently decent coastal cruisers. Neither offer obvious advantages beyond the Tanzer offering more room. A 1981 Cal is a different model than the one that I have a lot of experience with. The Cal line went thru so many changes at that point in time that I am not even sure I can visualize which of the 25''s that is.
You seem to be in part addressing your question to me. I had seen your question earlier and have really wrestled with how to address your concerns. Unfortuneately my only conclusion is that without really seeing the boats I don''t feel that I can give you very meaningful advise. I wish that I could be more helpful. (Where are these boats?)