The best expected was the PC version.
YouTube channel ElAnalistaDeBits has published a video comparison of the beta version of Diablo 4 on PC and consoles. Here is what the authors of the channel managed to find out:
Diablo 4 runs at 1080p on PS4, 900p on Xbox One, 1188p on PS4 Pro, and 1440p on Xbox One X. At the same time, the frame rate on all previous generation consoles is 30 fps.
The game is set to 2160p on PS5 and Xbox Series X and 1440p on Xbox Series S at 60fps, but Temporal Frame Reconstruction is used to achieve this performance.
On the PC, the authors launched the Diablo IV beta at a native resolution of 2160p, with maximum graphics settings, the frame rate reached 200 fps.
In terms of game loading time, it is around 5.5 seconds on PC, PS5 and Xbox Series, 36.4 seconds on PS4 Pro and 50 seconds on PS4.
The Diablo 4 OBT will run from March 24 to March 26. The game will release on all platforms on June 6th.