which one has higher fragging power?
sentinels can trap an area for position advantage while controllers get sprayed through smoke
Sentinels are just duelists that play in a more reactive role. While controllers usually are meant to be much more of a team player which sets up for their team. Viper and Astra are heavily team reliant. While Omen and Brim still are best used supportively.
Sentinels can frag better than controllers but the thing is you can't win without smokes but can still win without a sentinel.