I'm in the Intel syntax camp, pretty thoroughly. I use other assemblers, too, and the Intel syntax is a lot more similar to ARM, RISC-V, and assemblies used by DSPs (which are surprisingly C-like). The order of operations, the order of comparisons, the addressing syntax, and the lack of spurious wingdings characters all make it easier to read and write.

The one thing AT&T syntax has going for it is the "strong typing" of operand widths: `addl` is slightly more readable than `add` + operand-inferred width.

If you want the C preprocessor, you can have it with Intel syntax too (gas can use either), but I think the preprocessing syntax designed for assembly is cleaner with assembly code, and some of those preprocessors are surprisingly powerful.