Interestingly enough, I found two Lariat trucks that have "almost" identical options, one with Tremor and the other with the FX4 package. This is as close of a comparison you are going to get between the two, and what I discovered is the Tremor is $625 cheaper because of the $1710 in discounts. You will also notice, several of the other options are cheaper when combined with the Tremor. (3:55 Electronic Axle is N/C with Tremor, High Cap Towing is $1130 for Tremor vs $2730 for non-Tremor) They are definitely trying to make the Tremor more appealing when combined with popular features.
The lower price makes the decision to go with a Tremor almost a no-brainer, if you are good with the Lariat Sport, Ultimate and High Capacity Tow options. Since I hate Chrome on all of my cars, I will not buy a Super Duty without the Sport black-out package. This makes the Lariat a perfect fit for my use case.
Tremor w/ Diesel, Lariat Sport, Ultimate and High Cap Towing: ($1710 in discounts)
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FX4 w/ Diesel, Lariat Sport, Ultimate and High Cap Towing:
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