What is more important in your guys opinion? Whats better to cross train in if you are already training judo.
BJJ
dogface summed it up
alreayd paid for judo... so its either adding bjj or wrestling to the mix
ttt
What kind of throws/grips does your judo teacher teach? Does he show you how to do doubles, te-guruma, kata-guruma, etc. Does he show you more than just the standard grips (sleeve and collar (although those are great grips btw))? If he doesn't I would learn wrestling for now in addition to judo. Throws/takedowns take a while to get good at...
BJJ wiill add all of the details missing in your judo matwork.
Many bjj schools will also teach wrestling throws.