Just like anything else, you have to first consult yourself first. This is largely dependent on preference.  But of course, we can help you decide on this. A touch screen display will be easier on the eyes, but they will also have a shorter battery life.  Now if you are not the techie type and do not really care about the advancement of your hiking GPS, a button-operated one may fare well with you just fine. But then again, choosing this type is not enjoying the advancement we have today. However, if battery life is on top of your list, this is the better option. Also, think about the weather where most of your hiking will take place. For wet weather and areas, touch screens may be a pain to use as compared to button-operated ones.