If you aren't familiar with the products, I agree it would be best to stick to one line.
But with some time and experimentation you can find some killer combo's by using different products from different companies...
For instance my personal cars are all zaino-ed, but I do finish with a final layer of soft Dodo juice wax, as it gives some extra deepness to the shine...
(and allows me to have an excuse to add a new layer of wax, as the soft wax doesn't last nearly as long as the Zaino under it
)
Also Zaino doesn't have any good paint correction, (not a fan of the Z-PC), so I use another line for that as well.