My (equally limited) understanding is, that Kano studied a number of styles of jujitsu and took the "best" techniques (predominantly Kito-ryu) from each of the then remaining jujitsu ryu-ha, and incorporated these into the Kodokan syllabus. Each of the different styles of jujitsu (at the time) specialized in specific techniques - Kito-ryu was famous for its nage-waza, Fusen-ryu for ne-waza, Tenshinshinyo-ryu for its striking, throwing, holding, chokes, joint locks and aiki-type movements etc.
Particularly after the Kodokan's ignomious defeat by Fusen-ryu in 1900, was ne-waza incorporated into Kodokan "judo". It has also been reputed, that Kano sought out Funakoshi to incorporate advanced atemi-waza into the Kodokan syllabus.
Kano had an innate understanding of the principle of "off-balancing" and thus, the principle of kuzushi was a key feature in distinguishing judo from its jujitsu parentage, which tended to rely on superior strength and leverage.
According to his children, Kano was the consummate pacifist, and to him, ju jitsu was the antithesis of his concept of Do (the Taoist philosophical concept). It has also been reputed that he sent Mochizuki to study Daito-ryu with Sokaku Takeda and Kenji Tomiki to study (then aiki-budo) aikido with Morihei Ueshiba, in order to bring back such developments back into Kodokan Judo. Kano was reputed to have said that aikido was his ideal "budo".
Because of Kano's background as an educator, and his motivation in taking judo to the sportive level, and ultimately to the Olympics, many of the more "dangerous" techniques were relegated to "kata".
So, in broad terms, "judo" itself was a mixed bag of many different styles of jujitsu, and various innovative developments from an educational perspective. It is said that the term "judo" itself was already in use by such schools as Kito Ryu and Jikishin Ryu, prior to Kano "borrowing" the name. It is for this reason that Kano insisted that the full name for judo, is "Kodokan Judo," to avoid confusion with other schools of "judo" that existed at the time.
So, it would seem that one would be better off studying Kodokan judo (in its original form) than studying jujitsu.