New quarters

I have a general question about installing new quarters.
I am working on a 69 Barracuda 340/4spd and which is in need of some metal along the lower quarters, wheel lip and forward lower quarter. see pic.
Is it better to replace the entire quarter and cut at the top accent line from bumper to door jam or just cut out the rusty areas on the lower section?
I have felt in the past that only cutting out the rusty areas and preserving as much of the original metal was best. Then I see all the resto shows on TV where they cut away entire quarters which are perfectly good except for 1 or 2 small rust spots or dings. This has me questioning if I should replace the entire quarter. What is the general consensus on this?

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