Canning - I loved canning tomatoes and tomato sauce! The process of taking these beautiful tomatoes I had grown, and adding the other herb elements from my garden, gave me a true sense of accomplishment well into the Winter months.
The sauce and tomatoes were also very tasty, and held their flavors very well into the Winter months. We could also open a jar, use a little as a chicken or beef flavoring, close the jar, and use the remainder at some point later in the week as a pasta sauce (refrigerating after opening, of course.).
We stored the canned tomatoes and sauce in one of our pantry cabinets which was not used previously. I made about 30 Mason Jars of sauce which easily fit in the cabinet.
Freezing - Freezing tomato sauce was very efficient. Rather than using Mason Jars, I used freezer bags, and added them to the freezer to be used during the Winter months.
It's important to have a backup in the event of a power loss, but we were lucky last year with our power staying consistent through the Winter months.
Also, freezer sauce does not stay as fresh as canned sauce - there's a shorter life span. You also can't use a little and refreeze. Canning does allow a bit of flexibility to use a small amount and refrigerate for later in the week.