I feel like junglers have different styles.
Some hard farm, some invade a lot, some gank a lot, some favor Top and Mid, some favor Bot, some favor vision and counterganking and some favor being everywhere.
It all comes with your play style and what you view the most important thing to do.
Myself, I tend to leave bot on a island and focus most my time around top/mid and invading to put down vision. I then more times then not bring a pink and pink dragon, if its not warded I just solo it quick and be on my way.
I believe for the most part the Solo lanes are the best lanes to get ahead, if both solo lanes are ahead and bot can go even of even slightly behind. then you should technically be stronger going into team fights as Solo lanes have more XP, and GP. Doing this also allows me to take complete control of the enemy top side jungle. Doing this also forces the Jungler to bot side, Where you Support can generally do a good job keeping bot warded and they can just back off when they see the jungler.