I think a bigger difference than pure results was that Quintana was often able to be a genuine threat to Froome in the 3rd week and drop him in a straight fight for pretty big gaps. If 2013 and 2015 TdFs had 4 weeks, Quintana might have won them. Bardet's podiums to me feel a bit like he got them because the other guys tried to beat Froome and he was just there minding his own business instead. In 2016 he got a podium because he attacked on one stage and nobody reacted and in 2017 he got a podium by 1 second over Landa. He's never felt like a genuine contender for the win, he got his podiums just barely, while Quintana was a genuine threat to Froome. I think he lost the 2015 on the echelon stage?If we say the Froome era is the 4 tours Froome won:
2013: Quintana 2nd (4'20), Bardet 15th (26'42)
2015: Quintana 2nd (1'12), 9th Bardet (16'00)
2016: Bardet 2nd (4'05), Quintana 3rd (4'21)
2017: Bardet 3rd (2'20), Quintana 12th (15'28) (PS! Quintana did the Giro this year, finished 2nd).
Even if Froome didnt win the Tour 2014 you could probably say it belongs to the Froome era. Bardet was 6th, 11'26 behind Nibali, while Quintana won the Giro and crashed out of the Vuelta instead of riding the Tour.
I think you got to have a very strange view on things to say that they were on equal level. And even if you look purely at results 2+2+3 is significantly better than 2+3.