Oh jeeze, lots of posts. Well I've played Devil Survivor 2 and Disgaea. I thought Disgaea was FAAAAR to complicated for me, but I do LOVE Devil Survivor 2. I might check this one out. I'm a sucker for a good relationship system.
The battle system of Growlanser is much less complicated than games like Disgaea and FF Tactics. And unlike most tactical / strategy RPGs, it does not use a rigid grid-based system; you choose the path you want the characters to follow and they advance in real-time.
I dunno about it being more or less complicated but I do know that growlanser requires actual strategy and disgaea doesn't
Klyde - do check out riviera. Its the only story/character focused game in the series. The other dept. Heaven games all have a strong combat focus. Has relationship building and ending for each party member like growlanser