As everything else in this crazy world we find ourselves upon it all comes down to preference....
I have flicked to and from heavy and light staffs for various reason and now find myself practicing mainly with a very light staff and performing with an extremely heavy fibre3. Most moves are easier to perform with the fibre3 (as willworkforfoodjnr said) because the weight keeps the staff stuck to you and the momentum keeps it spinning.
In saying this, the sheer weight of this staff can be a little daunting at times...
I personally prefer practicing new moves with a lighter staff, the fact it is lighter forces you to do it right and not rely on the weight to keep it moving and stuck to you. If you get a move down using a spindly little staff, if you pick up a heavier one it will generally make it alot easier.
Hope my ramblings are useful

Good luck with the contact