Well lower response time won't magically make you a better player.
You need to have the skill to utilize that frame rate, but in most cases even the extreme human eyes can only visually notice 75fps, which in mornitor language translates to 75hz.
However monitors are sort of weird in how faster hz works. If your GPU runs at about double the fps then hertz, sometimes it generates whats known as ghosting on the monitor. Normally you can adjust vsync to the proper hertz to counter this (or Gsync / FreeSync), but some esports professionals want to run 200+ hz monitor and run them on TN panels which sacrifice a lot of color and detail for response.
As for OLED's they only have one advantage and thats depth of color.
A MiniLED monitor i feel is vastly superior with better HDR tones, and lower risk of burn in.
Its true modern OLED's have many burn in protections in place, but no one can gaurentee you that you have a 0 chance at burn in on a OLED. Even MiniLED's have a chance at burn in, but its substantially less, and there is no Auto dimming that kicks in like on a OLED monitor.
You have a very limited selection on both OLED and MiniLED. Again each has its own advantages, but a MiniLED with a lot of FALD zones will come very close to a OLED in blacks, and completely decimate it in HDR unless your playing in a dark room.
I have a OLED, NanoIPS, and a IPS.
My NanoIPS has better HDR then my OLED does unless im in a pitch black setting where the auto dimming doesn't impact me. (and there is no option to turn off auto dimming, as its also a burn in protection feature)
I do not know how the Q-OLED (samsung / Alienware) rank up, but this is my experience with a LG 48GQ900-B.
I love my OLED, but it has some issues that is making me wait for the new samsung G7 NEO 43 inch to replace it, as i think a MiniLED is probably a better monitor for wide area of tasks i do, and at the time of purchase, the Odyssey Arc was just too big of a monitor for me.