Hate to break it to you but the new 5.3L beats the new Hemi, (Go read car and driver article) and will hang with the 5.0L. Plus, the amount of issues the 5.0L has good luck! Ford has that thing so high strung right now, it's eating oil and munching timing chains like the cookie monster, but, hey, go ahead be my guest.
The 5.3L is a fantastic motor that gets excellent gas mileage, tows very well below 6k lbs, and if you want more power, get one that is E85 compatible, My 2017 was and I could take my step dads Ecobust or any Hemi all day long. They love that fuel.