EFI live is a tool that lets you tweak tables in your ECM and do a lil bit of playing in the TCM. They keep adding more tables and improving things as time goes on. EFI live also gives you just what they have opened up, you dont have open access to the ECM
Garantee? Them are strong words

The fact remains that the quickest trucks in the country could get thier tunes written from anyone for free I'm sure and they chose to use TTS. EFI live is a tool, the person using the tool is what makes the difference. The tuner is what makes the difference. And as tuners go no one has proven to me or anyone to make a truck run harder than TTS when they actually sits down with it. If he wasnt the best the fastest trucks wouldnt be using him. I'm sure this will encur the rath of many sides and have me branded as an "EFI live hater" and a cheerleader for TTS

EFI live is great, it lets you make your own tune. This is rewarding and can also be very fun! But its a tool, its up to the tuner to know what to do.
When someone comes along that proves to tune better then I will pay respect to them. Till then TTS is the benchmark IMO.