I think he made the right choice by going with higher clock and lower CU's for the cache, PS5 SSD is more than 2 times as fast as the Xbox series X, so he wanted the overall system to be as fast and simple as possible. He estimating the time-to-triangle a game is gonna be less than a month.
He stated this during the press conference.
"Teraflops is defined as the computational capability of the vector ALU, that's just one part of the GPU, there are a lot of other units and those other units all run faster when the GPU frequency is higher, at 33% higher frequency rasterization goes 33% faster, processing the buffer command goes that much faster, the L2 and other caches have that much higher bandwidth and so on"
"It is also easier to use 36 CU's in parallel than 48cu's when triangles are small it's much harder to fill all those CU's with useful work"
Consoles aren't about hardware, they're about good games.