Gardiner has double the goals, and only two points less, despite considerably less PP time.
He also has considerably better possession numbers, and a vastly superior +/- despite playing the same competition.
Given how much better Gardiner performed than Franson, when the two were apart (+/- difference of 17 illustrates this clearly), it's safe to say that Gards is the better of the two by a clear margin.
The only place Franson has a significant edge is in hits, although given his +/-, that may be a stronger indictment of how poor his positioning is.
Here is my case.
Franson has led the team in points for Defenceman the past 2 years. And he is paid at 3.3 as such
Possession Stats
Franson:
12-13 #1st on team for D
13-14 #2nd on team for D
Gardiner:
12-13 Not enough games for a sample
13-14 #1st on team for D
Very comparable, call it a draw.
Points Production:
Franson 62 Leafs all Leaf defenceman in this regard past 2 years *Franson
Gardiner 35 tied for 2nd
Franson wins this one.
HITS For:
Franson 282 1st Leafs * Franson
Gardiner 108 13th Leafs
Franson wins this one.
QOC
Last season.
Franson 5th for D on Leafs *
Gardiner 6th for D on Leafs
Close, comparable, slight edge Franson.
TOI All Situations
Franson 20.3
Gardiner 20.7 *
Close, comparable, edge Gardiner
Plus minus
Franson
2012-13 +4
2013-14 -20
Gardiner
2012-13 even
2013-14 -4
Edge to Gardiner for last season, Franson edge 12-13
GF per 60
Franson 2.39*
Gardiner 2.21
Edge Franson
GP
Franson has played more games past 2 seasons.
Edge Franson
Age Franson 26, Gardiner 24.
I don't see how anyone can claim if this went to an Arbitrator, Gardiner is far superior. Franson is as good or better statstistically in many of these catagories. The only one he loses is plus minus for a 2 year aggregate.