I haven't played the other ones so I'm not sure if I should start with this one.
According to me the best SRPG is FFTactics.
Well, I say more of a 9.7 ish range.
It keeps surprising me with little things and details that they put into the game. LIke character portraits actually getting 2 different portraits depending on what way they are facing. Instead of simply mirroring it.
Its certainly not perfect, but from what I have played its about as close as a game can get. --- If you want a friend in Washington, get a dog. Harry Truman.