NICEHCK EB2S Pro, or Sivga M260 For My Preferences?

Hello, as you may know, earlier I posted about my middle-ear fluid, and wanting to purchase flathead earbuds to compensate for the lack of use of my IEMs.

As a result, I was recommended two different flathead earbuds, but have a hard time making a curated decision.

As stated earlier, I would like recommendations based on the following preferences (I want closest, there will never be an exact):

Sound Performance and Sonic Character

- Clean, transparent, and balanced sound with little to no emphasis in any frequency range, while also providing the widest possible sound stage. All frequency ranges, generally have to be close in audibility.

- As these are flatheads and lack a seal, it has to have prominant/adequate amount of bass to where it doesn't sound flat or tinny.

- I generally hate warmth, so I avoid sets tuned with these characteristics.

Build

- Preferably metal, but this isn't a strict requirement

- Durable

Budget

- Under $35

Now, these seem to meet those, despite the Sivga being a little over budget, which isn't a deal breaker.

So, regarding sound, what is the most viable option?