Warrior, probably the second easiest class in the game to play next to mage. To be honest, probably easier then mage cause with mage you do at least need to pay attention to barriers/blink cool downs. Mage does require some common awareness which many do lack when it comes to staying alive. Granted you can just hit people with 400-700k ice meteors and watch em explode when shocking grasp hits them for more then that to.
Warrior gets it's barrier, 35% of your max HP. On top of that plate armor, with all of it's attacks hitting pretty hard, Fatal Blow being pretty damn beautiful hits. Die hard which = a additional, 30-40%? (cant remember) while making that ability 1 minute 30 sec cool down. so essentially looking at close to 160-175% more hp then other classes while holding a large amount of CC/strong spam able AoE(whirlwind) charge is wonderful, crushing blow is funny to use at times. I don't know if it still exists but at one point was a bug that if multiple warriors crushing blow back to back they could bounce you up so high fall damage could kill you.
Summoner is a pretty simple class to if you get enough gear to make VI strong. I will say it is a class that can go either way, you can either be OP, or you can be utter garbage with it. It is soft once blood aegis comes off, and if your doing PVE farming with multiple mobs that will come off quick. Side note summy heals are disturbingly OP. Even more so then plate healers cause you can always instant cast most of them and they tend to heal for full hp instantly or close to it. VI is a beautiful spell for farming though round up a couple mobs, throw a few VI's and let it do it's magic. Can toss in some of the lower mana cost DoT's but you can honestly get away with just throwing 3-4 VI's in a crowd of mobs while healing up.
All in all, for PVE. Warrior is probably the better choice.