Anywhere you sit in the Delta Club is bound to be good. I've sat on both sides of the field in the club seats and have never been disappointed. Especially for section 238 in particular, which was for a Seahawks-Rams game. Most of the seats here sit right on the 10 yard line but you're far back enough to be able to see both side of the field very well. The seats are also cushioned; most comfortable you will find at CenturyLink. Another major advantage we had was being able to go in the club area when it rained so we stayed dry and were able to continue watching the game. The dining in the club is also great, they have a number of "specialty stands" that are only available on the club level and not the rest of the stadium.
Just so you know, I know a lot of fans with club seats end up picking up their tickets at the Will Call window which is on the Northwest side of the stadium. The grounds are very big so you may not immediately notice where everything is.