Comparing Harris & Samuels

First off, I am not a football coach.  All I know about these kids is what I read on the internet and what I see in their video highlights.  I know we are all excited about the potential to land the overall ranked top RB recruit in Harris.  But, I'm curious what the general consensus is on who is the better back?  

Obviously Harris is the higher ranked back, but looking at their films, Samuels appears to be the faster, more elusive, and the bigger play threat.  Now, I'm sure if you're a fast, elisuve, big play threat that lends more to a great highlight film.  And, if your qualities are strength, size, balance, vision, etc. you may not jump out on a highligh real tape to the same degree.

FWIW Samuels is listed around 5'10" ish 190ish lbs and Harris is listed as 6'2"ish 225ish lbs.  Harris is obviously the bigger back, but Samuels is by no means a slouch as he is quite a well built athlete.  Right now we have Samuels verbally committed and are hoping to land Harris.  But, I'm not sure we will be able to hold onto Samuels if we land Harris.  Maybe others have a better handle on that than I do.  

But, I guess I'm really curious to figure out what it is that makes Harris so highly ranked, and so much more so than Samuels.  What that does not show up on film that warrants that?  And, if you could only have one, which one do you perfer?