Either MU or CZ (or both) give access to their own lounges to their own SkyTeam Elites (silver equivalent level), so in a sense this answers the question you're asking.

More generally, any partner other than DL will have the same lounge policy for ElitePlus. So are you just asking which carrier requires the fewest status miles for Gold or equivalent? If so, you're ignoring that fact that status miles are easier to earn on some partners than others. [For example, think about fares that earn zero on some SkyTeam FF programs but nontrivial numbers of status miles on other partners.]