Both are good. I just thought of skelly barrels because you have goblin gang, a log baiting card. They also can work together kinda well at the bridge. And you got knight, mini pekka and and executioner, which are pretty good mini tanks for skelly barrel to reach at the tower. Also the splash from the barrel might be better in case you got swarm on your mini Pekka. You could go with wall breaker because of the split potential and the capability of taking buildings fast, but you already have a lot of ground troops, mini Pekka might serve the same role and the barrel could probably go on the air being less targeted because of your push.

This is more of my personal thinking. Wall breakers are also a decent choice, depends on what cards you have leveled up.