General

Which staff is better? Please help

My current staff:
Level 110 Dragon Staff, slow, +27 INT, 171 magic attack, 2 hammers, no potential, 0 slots left.

Or should I get the level 120 staff from the Renegade shop?
Its stats:
Level 120, slow, 140 magic attack, hidden potential, 7 slots remaining.

Should I get the 140 m.att staff and cube it or should I just stick with my 171 m.att?

Or should I wait patiently until I get my hands on a 100% pot scroll (so that I won't destroy my 171)?

Also, is it very likely to get a good potential with a level 120 staff?
(What's the maximum number the %s can go up to- without cubing)

I know I am asking a lot. I just hope for answers...
You don't have to answer all my questions, but please tell me what you know!
Thank you! ^u^