Problem is, bot matters too much now. As a jungle main i obviously will try to gank mid but if there's an option between going bot or mid, you should know where i'll be going.
Also its really dependant on what champions you and your enemy mid laner pick, if it is easy to gank and if you are getting pushed to your tower, most good junglers will gank if they are able to.
You should know that if bot lane wins you have a much higher chance of winning the game, dragons are really important in the current meta and bot lane is 2 champions. If bot lane wins, you get all dragons, if you are that strong and able to take dragons, you'll obviously get bot turret and if top is losing they can swap and you take rift and it just snowballs so fast.
Also when you get ganked mid and survive, you take pressure away from the other lanes, that jungler chose to gank your lane if you live he doesn't get anything, reveals his position and you'll know if he'll go top or bot next which is really important.
Jungler should try to help mid if you get counterpicked, if without his ganks you can't win.