LH PE product is a bit newer compare to AC. I would suggest that you fly direct to FRA with LH instead of going via Canada. I don’t see the reason of going via another country. There isn’t any significant difference between the 2 PE products. The only significant one is in case you want to bid for an upgrade to C. LH has usually some “reasonable” minimum bids, for example around 500 euros per leg where AC bid is usually extremely high and not a good value.