DMM-side Deine recently also have gotten a defence multiplier in her SAW, to complement her AoE 3xPower attack, I believe, bringing her to comparable defensive parameters...
I actually made a calculation of Deine vs Gellius with the prince buff. Deine ends up at 6326 EHP and Gellius ends up at 6236 EHP. That's a difference of 90. Deine comes with the immense attack boost though and Gellius with resistance so it all depends on what you need.