Neither. If you want to draft Lions, pick the QBs and WRs.
If you have to, draft KJ first, but make sure you get them both.
Why would you draft KJ first? Tatum Bell is the starter and Jones has barely practiced.At the last minute KJ's put on the Active Roster instead of the PUP.... and suddenly he's a better pick than Tatum?
I think Jones could be better than Tatum from week 6 on(about their bye week forward) 10 weeks KJ better than Tatum IMO. I'm not sure if that much better covers the unmatched production Tatum gets in the beginning of the year. However, since this is a week to week hobby, I don't foresee starting Tatum with Jones around.
I imagine the RBs I draft ahead of Tatum will start for me and not Tatum.
Consequently, I don't see Tatum with any value to my FF team.
Jones, on the otherhand, could be coverring my byes so he'd have some value.