For me it is this:
For 2 reasons:
A) Cannot afford a higher grade, so no upgrading necessary
B) Lajoie portrait is the one T206 I wanted for my pc and now that I have in a good grade, it will remain in my pc for good and may even stay in a PSA holder which is rare for me
P.S. My C55 Joe Malone SGC 70 also fits the category of never selling or upgrading. Great grade and is the one pre-war hockey card I always wanted.