EML 2A3 MESH or SolidState plate

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Hi There!

Friend of mine has a Melody Astro 22 Black integrated amp which operates with 2 pairs of 2A3's in a PushPull fashion.
His amp is rated for 2 times 18 watts at 1% THD.

He wants to upgrade his Sovtek 2A3's with EML's but it's not clear if he can use both the MESH as the SolidPlate plate version.
Is it more save to use the solidplate version because it can operate at higher output levels in PP than the MESH version?

Thanks in advance