Exit no. from Namba subway to Dotonbori

Fron Namba (subway) was is the best exit number to take for Dotonbori? Thank you.

There is multiple exits along the way. There isn't gonna be one best exit. As it will depend on which line you arrive at and which car in the train consist you are in.
Just exit the station and head north.

#14 (or you could use B10 or #24)
http://walk.osaka-chikagai.jp/common/images/floor03.pdf

The point is that the underground station and shopping mall has a lot of exits, and is also pretty well signposted. I recall on my visits that the exit closest was a decent walk from the train when we got off, but knowing the exit number is not necessarily going to help if you don't know the layout (and if you did know the layout, then you wouldn't need to ask the question).

There is a map near the ticket gate.
https://goo.gl/maps/ZHBfCq8Lj9p
Guide lang also using English, no worry.

Also you can search at Google MAP, even official guide map of Dotonbori and more.
https://goo.gl/maps/Wcv1m27uZpz
http://www.dotonbori.or.jp/en/access/index.html
Other Exits out also possible, Google MAP thin pink colored area is underground.

Thanks everyone, for your help. It looks like I won't (shouldn't) get lost. :)