I own a Traeger Texas and have owned a Louisiana Whole Hog WH-1320.
I have first hand experience with Traeger and Louisiana Country Smokers and can provide info on both.
I can say the Traeger work on timers only if you purchased one with the 3 position controller or you are in smoke mode on the digital controller. If your using one with the digital controller and are cooking on any setting but the smoke position (lets say 225), it feeds pellets based on a temperature probe located in the cooking chamber.
The Trager is so far the best cooker I have used. The temperature distribution is far better then that of the Louisiana. I'm currently having a custom built whole hog pellet cooker built by the Yoder manufacturer that should out perform all of the pellet poopers mentioned above. To do so we measured the chamber temps with digital probes in 6 zones on the grill. The results were surprising. Traeger has done a good job on pellet delivery and heat distribution. Louisiana fell short with a 65 degrees swing in temp from right to left in the cooking chamber.
http://www.smokingpit.com/images/info/traeger-review/temp-comparison.jpg
Traeger has excellent customer service. I had problems with Danson's (Louisiana builder) in many ways and they literally shipped me a Factory refurbished grill that never went back to the factory to be refurbished. It was done in a shop in Minnesota that did not have a sandblasting booth. The grill arrived in poor condition and the left side didn't work at all. To fix the issue they send me new parts fro me to do the work. All the parts sent were incorrect and for 3 different grills. They did refund my money. But left me hanging and wasted weeks of my time. Traeger on the other hand, was amazing. I had a problem with my igniter and they overnight-ed the parts. The Louisiana grills are much more stout and just feel better made because of the heavier Gage steel. The Louisiana's also use a pot and are 100% timer based. The pot allows for a much broader temperature range as it allows for 5 degree increments where the Traeger goes from 180, 225, 250 etc. The Louisiana reaches temps from 140- 520 where the Traeger reaches temps from 140 - 425. These temps may swing either way due to ambient air temps.
I do allot of cooking for my site and I can tell you hands down the Traeger will produce higher quality food products. I recommend the 180 controller on these units. The issue with uneven temps is not due to a problem in the feed system of the Louisiana smokers. Its in my opinion a flaw in the heat distribution plate or what they call the flavor guard. Its arched in the center and the heat being fan forced, blows from end to end. Since heat rises, it will pool in the apex of the arch and be blown all the way to the opposite end causing the temp to be quite a bit hotter at that end. If the heat plate was flat like Traegers this would allow for more air flow up the side and more even distribution. The down side to Traeger in my opinion has been they sourced the build to China and have experienced quality control issues. They have however worked through that and from what I hear have resolved the issues. One of which was faulty igniters. This I have first hand experience with.
The new smoker I'm having built will use the Louisiana feed system as I like the granularity of the controls. We even have their new digital controller to try out. The body will be built Yoder style with 1/4" steel. This is what will separate the new pellet cooker from the others. Higher quality build (all welded 1/4" steal) and a better design for heat distribution and exhaust.
Hope this wasn't too much info. Treager are in my opinion better cookers. That is until the new build arrives.