Frieza vs Aggregor

http://fc02.deviantart.net/fs71/f/2013/254/f/1/frieza_vs__aggregor_by_jasonpictures-d6lya8p.png

description
DBZ vs Ben 10 which one of these baddies is the strongest in the universe!?

Aggregor
http://vignette2.wikia.nocookie.net/ben10/images/4/4b/Ultimate_Aggregor_official_artwork.png/revision/latest?cb=20140208180113