Originally Posted by
Philbert
I would not attempt a single 80 lbs above anything I had done in the past 6 weeks. For me, it is better to include 1 heavy single or double in each session leading up to a PR attempt. So if a new PR is the goal I would go for the 5 rep PR this time, then over the next 6 weeks incorporate some heavy singles, ramping to a single at 475 in mid February.
Edit: to answer your question: the better display of progress is the one that reflects your goals. If your goal is to continue building general strength then the rep PR is a better demonstration of that. If your goal is to compete in Powerlifting or in Strengthlifting the 1rm PR is a better display.