what has bigger radius, me splash10+AoE 21 vs melee splash lvl 21

so im having my animate guardian dual curse enemies and was wondering what will provide the biggest area of effect using only 1 gem slot. using a lvl 21/20 quality melee splash, or getting the corruption Gems in this item are supported by level 10 Melee Splash + a lvl 21/20 increased area of effect gem.

By my calculations, 21/20 Melee Splash has 18 radius whereas the corruption with 21 Increased AoE (quality on the latter doesn't affect AoE anymore FWIW) gives a radius of 21. This assumes you have no increased AoE from other sources, although you would need titanic (and very much unobtainable) amounts for the 21/20 Melee Splash to catch up.