I agree they are similar. The biggest difference is in the win condition though. Both sides have to take down the other side instead of one side only defending. You also didn't have to attack the enemy titan, you could just hold the missiles and let those finish it off. Meaning it never passed from conquest mode.
Yeah, the whole unlimited Tickets thing wasn't the best. That's why Rush mode is such a good mode. They added in the whole attackers ticket running out if they all cannot get to the objective.
That is what is bad with rush mode. It sets one team as attacker instead of having both defenders and attackers in a team. Conquest and its variants is so good because it allows you to play at different paces, for different objectives and still help your team (one person managing to sneak in and out a capture area over and over can occupy a lot of people, no killing needed, yet it helps a lot). Being somebody that likes to defend and ending up in the aggressive team in rush is just...
Conquest having dual ways the points count down is another good thing, killing a lot means you win, if the opponent manages to hold a majority of the control points it is hard to kill that much more though. I honestly don't see what makes rush better than conquest or its variants.
It can be argued that no points was a flaw of the titan mode, yet it was more akin to a mix of Capture the Flag and king of the hill than anything else when you came down to the scoring method.
The worst problem with rush is that it focuses combat in a game designed for a lot of players, widening the combat area is better than funnelling 30+ people into 1/100 of the total map area. Rush/plant the bomb modes are nice when you have few players though, it works fine up until around 16 when other modes start being better.