The same company which owns Trader Joes owns Aldi. They are different concepts though.
We have a grinder attachment for our stand mixer and have been grinding our own meat for a year or so. I feel like we have a little more control on the quality of what is being ground...a few less "parts". I have found a source for chicken leg meat which is cheaper than beef and we find after trimming the fat and adding some seasoning we like the chicken burgers as much as beef.