[bobajeff]

Yep, from a developers perspective there is very little difference between asm.js and WebAssembly.

The main differences for developers will be the download size for compiled code will be smaller and the startup time will be faster.

Outside of those differences all browsers will consistently optimize for it. At least one upstream compiler backbend (clang/llvm) will support it. So you'll get more tooling from outside of the few folks working on emscripten and you'll more likely see support from language frontends like Swift and Rust.