@LibsThere is very little difference between the 2 to be honest, and from looking at this from Antutu, say's the same when they run performance tests:
"The Exynos 990 is slightly behind the Snapdragon 865 in terms of CPU performance (6% behind), and Antutu speculates that this is the result of the Exynos 990's big core scheduling not being aggressive. In terms of GPU performance, the Exynos 990 is almost tied with the Snapdragon 865, with no significant difference"
- Xperia 1V - o2 and Spusu
- Pixel 8 Pro - o2 and Vodafone UK