I'm cross between Soulcalibur II and Soulcalibur III. SCII just has so much nostalgia for me (the soundtrack is like a fricken time machine, man) so it's hard to rate badly... It was also the time when the characters were at their best; no nerfing: such as human Raphael (with Paul as his voice actor :D), Ivy with her awesome voice (I could not stand the voice actor in III, IV, and V), TALIM WITH HER AWSOME VOICE (cannot express my hatred for her voice in III and IV), Sophitia, Cassandra -- I thought they were all at their best in II.
I'm stuck with SCIII because, well, it was more in-depth. I had no idea what was going on in SCII until I finally did some research. III also had lots of stuff to do -- even though I really enjoyed the off-story mode thingy in II (I forgot what it's called) Chronicles of the Sword is just fricken awesome. And hard ._. /still hasn't beaten it
And of course, Character Creation in III as well.