Getting flicker at top and bottom of screen - should I crop or zoom in?

Hi all, this is related to another thread I have here but I wanted to ask specifically...what is better...cropping or zooming?
I have just finished editing a long production in 16:9 and have been monitoring the edit process on a 16:9 television.
When the finished product is watched on the 16:9 tv, there is no flicker evidentat either the top or bottom of the screen.
When watched on a 4:3 television in letterbox mode, naturally the top and bottom edges are exposed and this presents some flicker at the top and bottom extremeties on some shots.
I can get rid of this flicker on the edges without re-editing time-consuming scenes by either zooming in a fraction or cropping the finished video top and bottom by a factor of 4 using the motion settings.
I have monitored the cropping method on the 16:9 screen and you cannot see it until it is cropped by a factor of 5, and of course on the 4:3 screen the cropping method will only mean there is slightly more black top and bottom on the letterbox effect.
I guess zooming in to get rid of the flickering will mean the quality of the picture degrades a little so cropping would probably be best.
Is this your opinion as weel?
Thanks in advance.

I guess zooming in to get rid of the flickering will mean the quality of the picture degrades a little...
Yes, any picture re-sizing degrades the original.
... so cropping would probably be best.
Yes. To avoid losing anything, you could always only crop the shots from the camera that has the flicker (might take a while).

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