for the LLY
seems to me dollar for dollar the edge has the edge over the TTS.

$595 for TTS and the ability to adjust nothing.

$655 for the edge with attitude and the ability to adjust numerous things.

what do you want to do with it?

Like Philip said, it depends on what you are trying to do.

If you want your truck to run just like stock, except with a good dose of extra power that's there all the time, I'd choose the TTS Tow. It removes the speed limiter, and you can get it with tire/speedo correction. You won't notice it's there except you get there quicker. Even when towing, it seldom downshifts on hills. It is plenty of power for any reasonable tow vehicle.

I ran the LLY Edge/Attitude for awhile, and it is faster by a bit than the TTS Tow, when you are at level 4 or 5. It is not as smooth though. At least with mine, it "coughed"/"barked" sometimes, usually when shifting.

You can run both and go even quicker.

For daily driving and towing, I'm still running the TTS Tow, even though I've run both the Edge and the Predator. I've got over 10,000 mi on the TTS Tow with most of it towing. You forget it's there.

If you are racing? The LLY Edge is quicker, as is the Predator.

Another thing about the TTS, you can't go back to stock for dealer visits unless you keep your stock ecm and pay for one to get the tow tune on, which is another $300. This isn't much of an issue for people out of warranty but I see that you have an 04.