There is a reason we love Quizz and it because he changes games. When looking at stats many people leave receiving yds off Running Backs stats. Here is a look at total yds for the top backs in the country, including Quizz. I would say Quizz is better than Gerhart. He averages 10 yds a game more and has a better yds per touch average.
Quizz
Rushing
G Att Yards Avg. TD Att/G Yards/G
11 239 1313 5.49 19 21.73 119.36
Receiving
G Rec. Yards Avg. TD Rec./G Yards/G
11 67 436 6.5 11 6.1 39.6
Totals
G Touches Yards Avg. TD Touch/G Yards/G
11 303 1749 5.7 20 27.55 159

Gerhart
Rushing
G Att Yards Avg. TD Att/G Yards/G
11 282 1531 5.43 23 25.64 139.18
Receiving
G Rec. Yards Avg. TD Rec./G Yards/G
11 9 116 12.89 0 0.8 10.5
Totals
G Touches Yards Avg. TD Touch/G Yards/G
11 291 1647 5.66 23 26.45 149.68

Ingram
Rushing
G Att Yards Avg. TD Att/G Yards/G
11 205 1399 6.82 12 18.64 127.18
Receiving
G Rec. Yards Avg. TD Rec./G Yards/G
11 25 225 9.00 3 2.3 20.5
Totals
G Touches Yards Avg. TD Touch/G Yards/G
11 230 1624 7.06 15 20.91 147.64