Compiling things with clang is faster and uses less memory.
Linux distros, package repositories, etc. are basically giant compilation farms, compiling packages making sure they work well together so that you don't have to.
So switching to clang might impact their resource usage.
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For you, the user, the performance of binaries compiled with GCC or clang is pretty much on par. Some binaries are a bit faster with clang, others are a bit faster with GCC, often in negligible ways.
If you are doing something that's very resource intensive, recompiling that software yourself tuning it to your use cases is probably going to have a much larger impact on resource usage than whether the shipped package was compiled with gcc or clang.
Linux distros, package repositories, etc. are basically giant compilation farms, compiling packages making sure they work well together so that you don't have to.
So switching to clang might impact their resource usage.
---
For you, the user, the performance of binaries compiled with GCC or clang is pretty much on par. Some binaries are a bit faster with clang, others are a bit faster with GCC, often in negligible ways.
If you are doing something that's very resource intensive, recompiling that software yourself tuning it to your use cases is probably going to have a much larger impact on resource usage than whether the shipped package was compiled with gcc or clang.