Group E

Cerberus(ffVIII)- Liked the summoning, the battle + more usefull.

Unicorn(ffVI)- By some reason I just can't stand Ixion.

Group F

Raiden(ffVI)-Cooler look and cooler name.

Hades(ffVII)- one of my fav summons in FFVII. Looks so cool + love all the status effects.

Group G

Bahamat(ffIII-X)- Ofcourse.

Mage(ffIV-V)- Cindy annoys me.

Group H

Levithan(ffIII-V,ffVII-IX)- Leviathan is way cooler in every way.

Atomos(ffIX)- like the summoning + the FMV.

Sorry, but I can't solve your problem.