but sounds like you are a novice on mitre cuts. If I am correct, I think that the cope method might be more difficult for you.
I do agree with Jennifer about the butt and cope joining method. I like it and use it where you do have off corners.
What I would suggest to you is: Use your mitre saw and cut your two 45's and then tweak only one cut to make it fit. Do not tweak both cuts only one will suffice.
Sometimes even sand paper or a wood file will adjust one cut to fit properly. You will not get a perfect mitre on something like a 95, but then, that is why spackling or caulk was made. You can use a good spackle to fudge the mitre and it will look fine and only you will know the difference. Everyone uses this now and then.
Now, there are two types of molding, I do hope that you are not trying to make this molding project with CROWN MOLDING. If you have crown molding, it will never work.
and I do appreciate Jennifers answer and I am not belittling her post at all.