I would say if still under warranty, avoid the actual ECU tuner, if detected during a dealership visit, they will black flag your truck across the dealership network. Essentially, your powertrain warranty of 5 yr/60 k will be gone.
Yes, you can try the Magnuson-Moss act, but 100% the dealer will just say no and make you give up or force you to take them to small claims court, which you are likely to loose anyways. Not worth the small increase in power that a naturally aspirated motor would give in this case.
Best bet is the throttle control module, best bang for the buck and can avoid warranty issues down the line. I would still remove it before a dealership visit just in case.