Foles was throwing lasers all day in the SB, and with the Patriots defense he needed to. Wentz doesn't have anywhere near the accuracy (on a consistent basis) that was shown by Foles, and supreme accuracy is what was needed to win the ring. Wentz would have led the Eagles to a tragic Superbowl loss, and atm I would choose Foles over Wentz because much of what Wentz does is based on his physicality and that has a big question mark on it moving forward.
But yeah, Foles in the SB played at a damn high level, and it's a level Wentz has never reached.