3D Mark - which tool to choose
Short answer: Unlimited tests in 3DMark and Offscreen testes in GFXBench.
Long answer:
It's hard to compare graphic performance though synthetic software. The main problem is that Apple uses their proprietary Metal API on iOS (OpenGL ES has been deprecated in iOS 13) while Android used OpenGL ES and/or Vulkan. So they are not the same from the ground up since the API overhead and driver optimization for hardware is different on both platform.
This is further complicated by other variables like software edition and hardware design for a device using the said processor (example: same A15 in iPhone 13 & 14, iOS updates, benchmark software). What's more, even the same processor in the same device performs differently due to other factors like background activities, battery health, screen brightness, temperature and so on.
In a word, results from cross-platform synthetic benchmark software like 3DMark and GFXBench only tells how well a device can run the test, not necessarily a full-on comparison between devices or brands.
If you want to do a proper comparison, you can look up the result database of the said software and analyze them yourself. Otherwise you will need a lot of data on various devices through repeated tests using unlimited/offscreen style test (after clearing as much background apps as possible) since they are render at fixed resolution and is more comparable between runs/devices and more representative of the graphic power of the chip.
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