I could be wrong, but I believe BlazBlue is dead. Injustice's tournament scene is thriving nicely, but the netcode is unplayable. Don't know anything about SFxT.
Blazblue CsEX is still played but not so much offline....if you want something easy to get into try Persona4. I'd recommend VF but it's mostly dead online.
BlazBlue had their community torpedoed unfortunately. Injustice is being played pretty widely but I personally don't like that style of fighter. SFxT is a Capcom fighter so regardless of what appears to be a negative public opinion, the game is still populated. If you like Capcom style fighters, the answer is pretty clear.
Thanks for the suggestions guys. Really appreciate it! =)
Julius, I completely forgot about Persona 4, might give that one a look first. Cyber, SF X Tekken had my interest due to the sheer amount of characters alone. Project B i've got VF5FS already. Thanks anyway though ;)
I will add that i also own Skullgirls. Sweet little game with great character designs. Anyway cheers again for the recommendations lads. May have to abit of renting & abuse EB's 7 day return policy i think
BlazBlue is not dead (and has new a version coming out), and Persona 4 Arena definitely worths a try. Injustice is very new and should be fairly active for a while. And how about Guilty Gear XX AC+?
sfxt. injustice is crap. one of the most unbalanced games ever. spotty net code, mannish female character models, interactive backgrounds get tired quick. rent before you buy.