Tekken but I have played others to back my reasons
Ive played SSBM and Brawl, they are fun, no doubt in my mind for the sheer reason of beating the crap of anyone you please.
7.5/10
Street Fighter 4 is not for me. I've even played 2 but I've never completed 2. Never could beat Bison he's so cheap and you could never change the differculty to an easier one. Oh Im not blaming bad controls either I can perform the Hadoken, uppercut I cannot spell, spinning kick I cannot spell, Sonic Boom, Flash Kick, Tiger Shot (high and low), Tiger Uppercut, Pshyco Crusher, Spinning Bird Kick and just about anything else in the game even most if not all ultra combos even Akuma's/Gouki's.
5/10
I've never played Soul Edge or the first Soul Calibur. Soul Calibur 2 was great as was 3 but 4 something was missing besides the storyline. I also prefer realistic combat. What I mean is that giant swords that make people dizzy when you defeat them isnt good really to be honest. However Seigfried's repeated stomp attack performed by pressing down and kick and repeating the kick button is bloody hillarious especially to the defeated person's head, it's a great stress relief.
8.5/10
Now Tekken. I've played and own all of the Tekkens even TTT expect these; Tekken Advance, which is 3 basically, Tekken Card Challenge which wasnt released in the UK or US, Tekken 5 DR I've played on PS3 but don't own and Death By Degrees which doesn't count as it doesnt have the word Tekken on it

and Tekken 6, which of course hasn't been released for home consoles yet. Before you quote my realistic part in the paragraph above, it's more realistic than SF4 by FAR. Okay so the devil gene isn't in real life and your abnormally strong and Tekken is now mixing this with an Egyptian God now. What IS realistic is the martial arts (in most cases.) Jin the main protagoinist turned antagoinist style of fighting is traditional karate. Bruce Irvin is kickboxing not Muay Thai, there is a differnece. The story isn't captivating I'll admit but it's better than SCIV's one by a mile.
9.5/10
If I offeneded you SF fans I'm sorry I just expressed my experince with the game