The 2014/15 forward group might be a bit deeper, but this current iteration should have a significantly better top-six. Obviously if players like Pettersson don't bounce back the team is basically screwed, but if the top-six plays to its potential we should be looking at 6 20 goal scorers, with some of them being 30 goal scorers.
The 2014/15 group had the still very effective Dan Hamhuis, Alex Edler, and Chris Tanev.
This iteration might have better top-end offense. But there is not a single defenseman that can provide the level of defensive impact of any of the three I just mentioned.
The Oilers and Canucks have the worst bluelines in the NHL, by quite a fair margin.