I've been studing Japanese Jiu jitsu for about four and a half years now, My question to you is how confused do you want to get? The more I learn, The more I realise how little I know.
Judo was developed as a safer way to practise traditional jiu jitsu and therefore judo's techniques are generally modifications of jiu jitsu techniques. They both follow the same principals, eg breaking opponents balance, yeilding to force etc.
A good traditional jiu jitsu dojo may be harder to find than a judo dojo, but you may be lucky and find them both rolled into one.
I'd say look for whats available and go try them, see what you like, The best martial art is the one you enjoy because you'll stick with it.