I can only juggle 3, but I prefer clubs. Balls are so boring they are so small and not spectacular. Clubs on the other hand, man they are rotating. Once, twice, treetimes, backwards. I believe that if someone stuck at this basic level of juggling 3 balls, he should try clubs - at least for me it's pure satisfaction watching these rotating in various variants before.

Many years ago one Saturday morning I happened upon a juggling shop. I could already do three balls so I asked if I could try the clubs. After about an hour of failing the shop owner said something like "some people never get it". So of course I bought a set. After 12 hours that day and 12 hours the next I got the hang of it. They are harder to learn than balls but still doable for an unsporty person like me. And, as you say, very satisfying.

You can also pass clubs. In fact, at my local juggling meetup (Castro Valley BART), it really breaks into two groups: passers and numbers. Passers get together and pass. It's quite social. Someone explains a group pattern and they work through it. OTOH, numbers jugglers can juggle 5 or more clubs+balls. They segregate themselves off and really only talk to each other. We're in the same place but numbers only talk to other numbers.

Learning club juggling was fun. That led to partner club juggling as well as flaming clubs. Got a nice video of me juggling flames and overrotating a club so I catch the flaming end. Whoops.