1. Smaller Size, chromium was just a smaller foot print with less legacy code
2. Better Performance. There was no doubt the before firefox quantum Chromium was the performance leader, Bink and V8 where superior then, today not soo much
3. Better rendering support. Like IE6 in the 90's today there are many many sites that ONLY work correctly on chrome, so if you use chrome's render you have less work to do, and will have less complaints by users blaming your browser for some websites poor code