Petrified Fish is a different company. I've been watching them for a few years now. They've come a long way from making knives in 8Cr13Mov and AUS-8 for other companies. Now they do one of the best heat treatments on Chinese D2 and have started using Bohler K110 with fun handle materials like Micarta, wood, and novel patterns in G-10. They recently started selling on Amazon and are also available at White Mountain Knives.
TwoSun is interesting. Like PF, their steel stamps have been confirmed multiple times via XRF. Build quality is decent. I have a few of their knives. Their kitchen knives in 14C28N are nice. Their TS262 is the most comfortable front flipper I've tried. While they are also available at White Mountain Knives, auction hunting on eBay remains the best way to get them if you don't mind the shipping time from China.
The only real complaint I've seen about TwoSun is that their heat treatment on "super steels" isn't great. For instance, their S90V did not perform as well as S90V from some better-known companies in a test by Cedric&Ada Gear and Outdoors. However, it's worth noting that the edge retention was still pretty good relative to the price of the knife. This actually happens a lot for affordably priced mass-production knives in "super steels". Watching cut testing from Outpost 76, we've seen this with a lot of mass-production knives in S35VN and M390 from different companies.
Overall, the best budget knives are still coming from WE via their sub-brands, Civivi and Sencut. Oppositely to the issue above, they've perfected the heat treatment for 9Cr18Mov. In the same testing format from Outpost 76, WE's $40-50 knives in 9Cr18Mov were able to achieve edge retention a lot closer to those less stellar knives in S35VN or M390 that cost two or three times as much.