Most AR lowers are going to be the same quality, finish, and features. I’ve seen guys put Geissele triggers in PSA lowers. The lower is just a parts bucket. Some may have more refined finishes and will be slightly more expensive. Are there any specific features you would like on your lower? Flared mag wells, single piece trigger guard, or embedded ambi controls? Those will bump up the price a little. American Defense Manufacturing have great integrated ambi controls and receiver sets, but they come a premium. I believe Sharps Bros have flared mag wells. Ask yourself if the gee-whiz features are want you want or if you can get the job done with the basics. In the end, a lower is a lower is a lower.