I can agree with that, but the rush and feeling of accomplishment isn't the same really. In Trials you have to think tactically, work as a team a lot more etc. Sure you need to work as a team in IB but not to the same degree. In Trials every death matters, be it because you leave your team 1 man down until the revive, the res sniping or simply helping charge the enemy's supers, it's definitely more demanding.