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Refresh cap at 50hz and monitor upgrade suggestion

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Hi people,

I'm hoping to get some insights with you here, I want to
  1. Understand why refresh rate was capped at 50hz in Macbook Pro with the monitor Dell S3422DWG
  2. Get your opinion about the 2 monitors that I have selected
  3. Understand usb c connection for video

Just so you understand, I use my monitor for work and games.
For work, I use it with a Macbook Pro 13, M1, 2020 (thunderbolt 3, 6K@60hz), through a Baseus HDMI 2.1 cable (8K@60hz or 2K@165hz) and a Baseus 8-in-1 hub/dongle (4K@30hz).
For games, I use it connected to my desktop PC (RX 6750 XT) through a DP 1.4 cable (8K@60hz).

Currently, I have a Samsung Odyssey G3 F27G35T, which is 27" FHD, and I use it with 144hz in windows and 120hz in macbook.

Last week, I bought a Dell S3422DWG, which is 34" WQHD. With my setup that I described above, I got the expected 144hz in windows, but my work macbook only got 50hz max. I assume it is because of the hub/dongle, but would like your opinion.

I returned the monitor, I also had a hard time to get used to the ultra wide aspect, combined with the small letters in the screen due to the high resolution.

Now I still want to upgrade, but I learned that I dislike ultrawide and curved monitors Smile

I selected these 2 monitors below

- Dell Alienware AW2724DM

- Cooler Master GM32-FQ

Both IPS, flat screen, QHD (2K), but the CM is 31.5" and the Dell is 27".
The CM is ~$160 cheaper than Dell. Here in Brazil, today, the Dell is R$3000,00 and the CM is R$4000,00.

If I upgrade to either of these monitors, most likely I will still have the same refresh rate problem on Macbook, because of the high resolution, right?

I'm thinking, if I go with the Dell, it has 2 DP ports, so I could buy a USB C to DP cable and connect both desktop and macbook to the monitor, and the DP directly in my mac, without using the hub/dongle. I "think" it will solve the issue and allow the bigger refresh rates.
If I go with the Cooler Master, I could either (1) buy a USB C to USB C cable and use it directly in my mac, or (2) use my HDMI cable in my desktop and a USB C to DP cable in my macbook. The CM HDMI is 2.0 only, but regardless, it will still display at least 144hz in a QHD monitor, which if fine for me.

I have zero experience with USB C port for video, or Thunderbolt .... what that looks like? I searched and saw some USB c to USB c cables, but they only mentioned "fast charge 100W" etc, and nothing about video. I think I must search for thunderbolt cable instead, right?

Anyway, what would be best, a USB C thunderbolt cable or DP?

With this all said (sorry for the long text, but I wanted= to provide as much information as possible, since there are a lot of variables), which monitor would you pick? Any suggestions is appreciated. Thank you guys

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