In no particular order:
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PETG – Every spool I tested under $15 on Amazon worked fine. Brands tested (in no order): 3DJoHor, ELEGOO Rapid PETG, and CC3D PETG (same factory as HZST3D).
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Polycarbonate – Only used CC3D, also sold under HZST3D.
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PLA – Everything above, plus Jayo (AKA Sunlu), though it’s now priced out of the under-$14/spool market. See my post: So you think your high-priced fancy-schmancy filament is the best?
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TPU – Tested three brands; only ERYONE made the cut, but it’s still overpriced at $14 for 0.5kg.
That’s not part of my testing criteria, and I don’t own an AMS. I primarily print functional parts. Truth be told, I don’t think much of Bambu Filament—overpriced, poor customer service, bad shipping terms, and a nonexistent return policy. Early on, when testing a new filament every two weeks, I returned about 1 in 10 spools to Amazon, even after using 30% for calibration. No questions asked. That kind of service—along with 1-day to same-day shipping—is something Bambu can’t even dream of matching.
That’s debatable. By my standards, even Bambu filament doesn’t print well without tuning—but I’m picky. 
I have a modified P1P with a printed pegboard enclosure. One benefit of mastering filament calibration is knowing which filaments print best on which surfaces. For example, for PETG, I use my engineering plate with a Kapton overlay. See this post on Gizmo Dorks Kapton Sheets.
Then I may not have much to offer you because price is my first criteria. But consider this—if you could get 1-2 spools free for every two you buy, just by fine-tuning and building a filament library, would that interest you? I don’t mind paying when I get my money’s worth. What I can’t stand is buyer’s remorse—overpaying for an inferior product with bad service. That’s Bambu Filament in a nutshell in my experience, and I have enough posts here showing the results of untuned Bambu Filament.
The only time I bought Bambu Filament after my initial P1P purchase was when they forced me to. Early on, they routinely ran out of Basic PLA, and I had to turn to Amazon just to get Black PLA to finish my P1P Pegboard case. But in hindsight, Bambu actually did me a favor. By pushing me onto the open market—something I likely wouldn’t have risked otherwise—they made me realize that filament is filament. Once you master calibration, almost all of them perform well. I will give a nod to their PETG HF, though—it prints almost as flawlessly as PLA-CF, which in my experience holds the record for “perfect” print quality with minimal tuning.
** Edit and disclaimer: I want to make one disclaimer: I know that I have definitely not exhausted all filament tuning options—just the high-level ones like temperature, flow ratio, PA, and max flow rate. There are many more parameters, such as first-layer speed, that can make the difference between a successful profile and a failed one.
As an example, I had a failed print overnight, which turned out to be due to not using a clean plate. However, I also discovered that adjusting the first-layer print speed improved adhesion. This was a first for me, as it wasn’t a parameter I had previously experimented with. It also makes me wonder if some of the filaments I returned to Amazon might have performed better now that I have more experience. Proof that one should never stop learning, this is what science is all about.
