you need to pick what is right for you drive both engines! I went in for a 5.3L left with a 2.7L it was better for me, that doesnt mean its better for you. I test drove for awhile before i made the decision, make a list of what is most important to you HP? MPG? Do you plan to keep this truck long term? Will you tow? this is why GM has so many options its a big purchase so there is no cookie cutter method. I searched forums before I bought my truck and watched tons of you tube videos to see what peoples thoughts were. Just my two cents!
but there is a point the 10 speed is legit I have 8 speed and its legit I bet the 10 speed is even more on point!