Borla hs been around for at least 45 years, probably longer. Their exhaust units are premium quality, extremely well-made and durable, and are priced accordingly. I never heard of Nameless before I bought my Subaru and started coming here. I assume it's a Chinese-sourced exhaust, and is cheaper.
If you look in the "for sale" section, you will find a LOT more people trying to sell barely-used Nameless axle-backs than you will find selling Borlas. I suspect that's partly because the Nameless is cheaper and more people buy them, but also because the Nameless is just too annoying to live with on long highway trips.
Don't know much about Borla, but Namesless isn't Chinese-sourced. All the parts are made in the US and to-order, which is why some of their wait times can very depending on what you order. While it is cheaper, the quality is great.
The only reason I would go for one or the other is that they have different tones to them. At the bottom I'll link a video to hear the difference which also has other axleback exhausts included.
The main reason that people are returning them is the droning due to, what seems to be, base models where you are not able to control the RPM with the CVT motor; 5MT is a different story I could be wrong that it's a higher percentage of base models, but please correct me if I'm wrong, anyone. When you control the throttle above like 2k RPM, its nowhere near as droney and actually sounds great, since the CVT won't automatically try to keep it withing the 1.25k - 1.75k RPM range for fuel economy and lack of a sport mode.
In my opinion the Borla axleback has a throatier sound then I'm used to, so the Nameless 5" is great. Since you have a hatchback, I would look into the Muffler delete or 5" version of their quad-exhaust since it looks and sounds great.
Happy shopping! Post the oh-so-beautiful sound clips of whichever one you get
Video of the exhaust sounds:
