It's seems like the overwhelming preference is to tele into a gank, and then walk back, but this seems to leave you far more open to get your turret taken.
why not TP to both?
You TP to gank only and only if you see an opportunity instantly, if not it's a garbage TP gank. Also you're not sure that your gank will succeed if you just walk to botlane, what if they play safe and it's warded? That's why in general you'll see more tele ganks (mostly counterganks btw, because these are usually the best opportunities)
Be Jhin or Ziggs and gank from your lane. :D
It really depends on the situation, I think if you could choose either then ganking THEN teleporting back to lane would be the most efficient - the alternative will wind up with you probably losing a turret. But sometimes tele ganks are too good to pass up, or you may save your bot lane, etc.
Teleporting in for a gank tends to be slightly more consistent, especially on lane bullies like Darius or Garen. It also lets you rotate to mid lane, on your way to top.
Depends honestly. If you're roaming mid, then gank and TP to lane or double gank and hit up bot before basing. If you need to make a reactionary gank, then TP in and walk back to lane.
Running to bot can make it a waste of time if they see you, even if they don't, you get zero cs waiting in the bush.
With TP you can simply farm as usual and TP at the right opportunity (They overextend, doing dragon, etc)
it depends on the situation. Especially if premate and thus with coordination, the tp-gank(or more often counter gank) can be massive, however, especially without a proper ward and without an instant impact skill like malph ult or poppy E, chances are that the opponents get away and you basically wasted yout tp for notzhing, loosing out some cs and xp while your tower takes damage. Roaming to another lane after pushing, lurking for a ganking opportunity and TPing back to lane once the wave is about to hit your tower comes at lower risk for you, but the chances for an succesfull gank are also lower. Your also more limited in who to gank, cause walking all the way bot from top would be alot wasted time, though you can try a bot gank after recalling. Still, without premades, especially in lower elos, useing TP to get back to lane is most of the time the better option, as tp ganks are unreliable without proper coordination and without proper ward placement.
Tele gank if good ward placement is better, less time hiding in bush..always puck hard cc vs shen hue
