I kind of compare the Kamara vs. McCaffrey debate to the JJ Watt vs. Cam Jordan debate.
Both sets of players were drafted the same year and have similar career stats. However, they got those stats differently. Watt/McCaffrey had a handful of MONSTER seasons racking up HUGE stats but lost big chunks of seasons due to injury. Kamara and Jordan have had very consistent probowl caliber seasons with few games lost to injury. That consistency is reflected in the probowls vs. all pro awards the players have received. Kamara/Jordan have more probowls but McCaffrey/Watt have more All Pros. Frankly, at this stage, I would take my boys Kamara/Jordan due to consistency and availability.
Comparisons here:
https://stathead.com/football/versu...ource=pfr&utm_medium=sr_xsite&utm_id=WattJ.00
https://stathead.com/football/versu...ource=pfr&utm_medium=sr_xsite&utm_id=McCaCh01