I already posted the link in another reply, but this is a good overview why wasm32 is usually the better choice over wasm64:

https://spidermonkey.dev/blog/2025/01/15/is-memory64-actuall...

TL;DR: wasm64 has slower memory load/store operation because it requires 'software bounds checking', so unless you absolutely need more than 4 GB RAM, wasm32 is the better choice.