Couple observations:

How would the dust stirred up from the laser bolts be done in the early 80s? Seeing those takes me out of the experience a bit as they would've been very difficult to create back then.

In the original clip, when the TIEs enter the canyon they do a little positioning maneuver which adds some visual interest in to what is going on. In the revisited clip, they enter via a straight line which not only has less visual interest, it also doesn't make sense that they'd collide flying so evenly spaced.

The original canyon had some texture to the miniature and walls which gave it a good sense of scale. The revisited canyon looks to only have one size of texture on it, and it's so big relative to the ships it no longer looks convincing.