I'm stating this now. I am NOT a Suikoden fan. I know, it shocked me too, being an RPGamer and all.
Anyways, out of my own personal tastes and gameplay, I prefered the 4th game the best. Your characters made their moves separately instead of one action for two people. I have yet to try the new Tactics or Suikoden V, but i'll get back to you on that. Still having fun with DQVIII, DDSI & DDSII.
You will walk in fire, earth, water, and air, through temptation, and at last into despair and desolation.