For pure SD, Jujutsu as you train against weapopns, people dont tend to mug you with their fist unless there are a couple of them.
But Judo is an awsome art and their is grappling in it. The biggest advantage Judo has is the man to man contact, you are always fighting, so you get a great sense of balance and unballancing your opponent, a good throw on a hard surface can eliminate the need to roll on the ground as well, but you have the skills to do so if you have to.
I am a Jujutsuka, but we have several Judoka's in our Dojo , Sensei did Judo in his youth and we train under Judo like rules all the time to build our attributes to better effect the nastier techniques of Jujutsu in a fight.
So if you can only do 1 and SD is priority #1 Jujutsu, but if you can, I would do both, many do.