It's a hard decision really, personally ninjitsu and wing chun have been the most usefull/practical to me. This is mainly because neither use big movements or need a lot of space to utilise. From the instances I've had to use them (I think i have a big neon sign above me that says "mug me please!") being able to use close up techniques has saved my life, not to mention my phone and wallet many times
I've found that I do not need to carry a knife or baton like my friends do, instead I can use a few key punches to disable an attacker.
Ninjitsu taught me restraint, the other martial arts that I studied did the same but not to the same extent. Granted this depends on the dojo in which you studied in, my ninjitsu teacher was ridiculously strict so I knew what to hold back.
That's the most practical thing you can be taught in my opinion, if you don't hold back you can get yourself in allot of trouble.
Jam it back in, in the dark.
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