My opinion is that peak gains between the two, or at least comparably matched tunes (say, stage 4 LMS vs. a similarly aggressive mapping from Torrie), is not likely to be huge.
That said, and even though TMS claims their tunes not to be "canned", there is still absolutely a conservativeness to any.....canned tune. It's designed to be applied to dozens of different engines, running different gasolines, in different climates, in different elevations, etc..
Even if you're not interested in dappling in ethanol, a custom tune IS better, becasue as already stated, not all engines are created equal, not all climates or conditions are the same, and this is the biggest one - gasoline quality and formulation can be drastically different, region to region, with some being a great deal shittier than others.
But, LMS still does an excellent job, and by all accounts their semi-tailered tuning solutions do a great job. But, a custom tune is just that extra step. And if you want to play with ethanol, as it has been proven here, even without any modifications to the 13+ fuel system, it opens up a new world for an engine tuner.
If you're okay with sticking with reformulated E10 or conversational gas, and aren't interested in data logging and email correspondence and all of that, LMS is a super easy, great tuning solution with excellent, noticeable results. The Men's Warehouse of tunes.
Unleashed can be your tailer.
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