If youre going 280 i would recommend an arctic liquid freezer ii 280. It does the job and the offset mounting is better for the 5900x chiplet design. If your going 360 the offerings expand to the Lian Li Galahad 360 and the EK series of AIO’s in addition to the Arctic Liquid Freezer 360 version.
I chose the Arctic for the balance of low/no noise superior coldplate design which translates to superior cooling and PBO headroom and no RGB.
I do hover between 4.9 and 5.1 ghz in flight with this aio installed. Thermals are kept fully under control.