I tried out Ogre Battle for the SNES when I was young, but I found it too intimidating back then, so I didn't get very far. I did end up playing Tactics Ogre: Let Us Cling Together a few summers back; I enjoyed it a lot. I'm not really sure how it falls into the overall series though (e.g., whether it's just a spin-off, etc), and it's more typical of the SRPG genre than I remember Ogre Battle being.
I can't think of anything similar to Ogre Battle in terms of gameplay though, partly because of my limited experience with it. There's probably a couple that never saw the light outside of Japan. (I've been wanting to check-out the Langrisser series for a while now, but the language barrier...)