Valkyria Chronicles 2 might be my favorite, takes the original concept and breaks each battle into separate smaller battlefields going on at the same time. It also has a great system for fleshing out the supporting cast. Might wanna hold off if you're allergic to spoilers and you haven't played the first, as it kinda hints at who lived and who died.

Tactics Ogre is arguably the best SRPG of all time. It's unique as remakes go, as it's almost like they took the original design document and made it like it's a brand new PSP game. A lot of members here like it and if you liked Final Fantasy Tactics, this is pretty much FFT2.