I dont fall in requirements category, but i can tell you what i know.

Sammurai is close range melee class with top dps IF (!!!) done right, meaning you have to adopt to situations and be flexible. Lots of people fail hard with sammurai
Summoner -well you know what i gona say here. Lots of people think its dps is no longer good, but Squere enix balanced classes arround new max level - 70. Therefore lvl 60 got bit broken...

These 2 classes dont really compare. From what i gather they balanced everything around lvl 70.