I dont knw about d Mgt Trainee position, but I know with d new Min wage a graduate in Lvl 08 in a Fed Minstry can earn as much as 70k as basic salary, but d good thin about Govt parastatal is dt there are a incentives dt come up which will surpass ur salary (depending on d 1 ur at), cos I gat a relative in same position in a Fed Minstry and each time she attends a project inspection or employee training, she makes btwn 150k- 250k (and they keep coming up).
Ther's job security and less stress, so if ur faced wit 2 options choose wisely. Cheers.