With NW WP, you'd be SkyTeam Elite/NW Silver Elite after 25,000 EQM in a qualifying year, which would last through the rest of that year as well as SE for the next year. If you reach 50,000 EQM in a qualifying year you'd be SkyTeam Elite/NW Gold Elite, which would last through the rest of that year as well as GE for the next year. If you reach 75,000 EQM in a qualifying year you'd be SkyTeam Elite +/NW Platinum Elite, which would last through the rest of that year as well as PE for the next year.

With KE you'd be SkyTeam Elite when you reach 50,000 EQM in a year (30,000 of which must be on KE - NW doesn't have that restriction) which would last for two years, and to retain that status you have to earn 30,000 EQM (20,000 of which must be on KE) in the next two years. You'd gain SkyTeam Elite + status after attaining a lifetime of 1,000,000 EQM, which it seems you retain for life.

As to which benefits from status and which rewards from RDM (redeemable miles - for awards) would be best for you, you'd have to delve into the benefits and rewards in each program.

The SkyTeam benefits of SkyTeam Elite and SkyTeam Elite + will be the same no matter which program you pick.