Having one team on victorOps and the other on Pagerduty I can say that pagerduty has better UI and mobile app. The scheduling UI in vitorOps is a mess.
Worth recalling that PagerDuty is a YC S10 alumnus. <a href="https://news.ycombinator.com/item?id=758653" rel="nofollow">https://news.ycombinator.com/item?id=758653</a>