Let's say I'm trying to accomplish a task on a mobile app, in order to do so I need to choose one out of 2 options, for example, confirm via e-mail or text message.
Each choice leads the user to a different "path"
What's the best interface solution to present this choice to the user?
It depends on what happens on selection of that element.
1. If it is a link to a new view/site, simply using two different buttons is usually clear:
This is an online shop giving the user the possibility to either log in into their account or to create a new one. You can see that the buttons are styled differently for primary and secondary actions.
2. If it is a "toggle" that adjusts what is currently shown on the screen, you can use something like iOS' "segmented controls":
Here you can see how choosing one option immediately affects the content shown on screen.
The easiest way to use the buttons with the required functions. Note that the buttons can be of different design and color. So you can make a brighter button and use it more often. It will draw attention to your goal.
I would use something like this. Not necessaraly with this animation, but big enough so it can be toggled; left one option, right other.
