The best summon for final fantasy series?

I liked Shiva, Phoenix and Ifrit in Final Fantasy 7. So far, out of what I've found, I like the Minotaur Bros. in Final Fantasy 8. And my overall favorite was in Final Fantasy X. Yojimbo, even though Bahamut and Anima were stronger.

im not really sure in terms of looks i like Valefor from FFX but also i really like yojimbo cause its REALLY nice that you can just pay it a lot of money and be rid of a boss using Zanmato though hes not very pretty and its even usefull in the multible stage bosses like getting rid of the second stage of Yunalesca(I really hate those multible stage bosses!)

For me, the best summon in the Final Fantasy Series in the PSX would be Shiva in Final Fantasy VIII

So hard to choose. Ummm... I'd have to say that I used Anima the most to kick butt. xD Although he/she/it sure was freaking ugly.

I have to say, my favorite summon would have to be the Magus Sisters in Final Fantasy X. They are the absolute coolest and they manage to stay alive a lot longer than the others. Bahamut is cool, but the Magus Sisters are the best.