It is useless comparing the sound because it really depends on what do you compare. What if I compare the highest cymbals series from Zildjian vs Sabian lowest.
You get the point right?
I made a comparison of Sabian cymbals.
I can tell you some impressions from my personal experience due to the fact that I play only Sabian and Zildjian.
The reason is not just the sound but the flexibility. These cymbals last more and do not crack that often as Meinl or Paiste. I think alloys they use or the process of making the cymbals is different.
I cracked so many Meinl and Paiste cymbals but still not crack Sabian nor Zildjian. Maybe I just learned to hit properly and relaxed or maybe these cymbals are really more flexible than others.
Both are very similar when it comes to tone. If you would compare them with Paiste you would notice that they have a more modern and versatile tone.
On the other hand, if you compare them to Meinl they have much brighter tone since Meinl focused on a dry and dark tone
Both companies have great sounding cymbals and it is just a matter of your personal preference.