Who is a better employee, old school or new school?

I have 2 people who are interested in a position I posted for a apprentice/helper. I took each of them on a one day ride along to see what they thought about the position.

One is an old school guy, hard working, knowledgeable, rough around the edges, "get it done" mentality, just your typical guy who grew up in a different time. The other is a 24 year old, energetic, absorbing of information, helpful with technology, very much one of those cell phone kids. I would say that those are are the pros of these two but they also have cons. The older guy is set in his ways, smoker, hard headed, know it all. The younger guy showed up 10 mins late, on his phone all day, had to stop for lunch, complained about getting dirty.

I did like them both and saw advantages to both, but also disadvantages. 

I wonder if anyone else has experience with these types of guys? Am I missing something that I should reconsider? Maybe neither one is the right fit?

Maybe for context also, I am 40. I maybe have a foot in each each of their worlds which is why the decision isn't as easy as I thought.