I can't speak for the Eskimo But I do personally have the Clam X600. so here is the stuff about the X600 that you asked :
Poles : they are 11mm heavy duty poles and are very rigid.
Hubs : very heavy duty and well built. (in the event a hub or pole fails and needs to be replaced Clam has replacement hub kits that include not only the hub but a full set of poles for that hub.)
Zipper : older Clam hubs had zipper issues but all the recent stuff use better heavier zippers now.
Carry Bag : Clam uses over sized carry bags and also includes a strap to put around the house and help compress it so it fits in the bag easier.
Weight and specs : I will add a link for this.
One plus for the Clam X600 is that you have the option to buy the add on floor for it if that is something you would be interested in at some point.
https://shop.clamoutdoors.com/x-600-thermal-hub-shelter.html