Right now, the compact titan launcher can only fire AT and AP missiles, while the longer non-compact titan can only fire AA missiles.
I can understand why the compact launcher can't fire AA missiles, as they need a lot of fuel and have a high range, but having two different launchers lowers the flexibility of using the titan.
I suggest adding AT and AP missiles for the non-compact titan launcher, that would have a higher range and allow for switching between AA and AG quickly. The downside to this would be the increased weight of those missiles.