Early last year I looked at both of these reels and could not make up my mind. I ended up buying both with the intention of returning one, this was with the salesman's advice and permission. I fished both on a Friday, Saturday and Sunday for about 8 hours each day. I ended up returning the Stradic. The Quantum just was a better feeling reel. It handled the bigger fish better, it was smoother and seemed to be a better made reel. The only complaint I have of the Energy Pti is the drag. There is not much a setting difference between tight and loose.
Just in case, this is not to say that the Stradic is not a fine reel, I just like the Quantum Energy Pti better. I now have two of them in the 20 size and I would I highly recommend it.