Having dabbled a bit in judo, jujitsu, and backhold wrestling, as well as doing a fair bit of TKD, I'd suggest that whether to take up Judo or JJ could be influenced by whether you've done any other styles before. If you've tried striking arts then jujitsu would allow you to keep and use some of these whilst also learning serious grappling. JJ also has the bonus that some styles include weapon training (if that appeals to you). That being said, judo is great too.
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See how well I block your punches with my jaw!!

Supporting everyone saying "nuts to cancer"