A general statement about quality and actuality of different imagery providers simply is not possible.
All global imagery is a patchwork of countless small images stitched together from various raw images in order to avoid cloud cover, reduce license fees etc. etc.
Very often imagery from different providers is derived from the same raw source. On the other hand image capture may vary more than ten years.
This may vary drastically not only between countries but sometimes within kilometers. In some cases it may even vary within zoom levels.
In addition the “ranking” of imagery changes constantly as new imagery patches are made available by providers.
Maxar is no exception from it. There were regions in middle asia where the imagery was roughly ten years ahead of all others estmated from the amount of new roads built in the meantime. New built houses and replacement of wood by farmland are an additional hint for actuality.
Actuality of the road net on maps is a very important feature in difficult accessible regions. I just want to mention the Nepal earthquake.
In this sense the unavailability of Maxar imagery is a considerable loss in several regions whereas is does not matter at all in others.