Or when you buy a 5.3 1500 you get a crapper of an axle (10 bolt) and tranny. While in the 5.4 Ford you get a 9.75 and a decent tranny.
I tow with a 5.4 1/2 ton 2v (02, PI heads) and it does the job a lot better then 5.3s. A lot. Even when the Gm is set up compairable.
The GM might ride a little better which contributes too the whole "I forgot I had a trailer back there thing" That a lot of GM owners like too tell.