Need advice on hardware purchasing decision: RTX 5090 vs. M5 Max 128GB for agentic software development

Tl;dr - For software development, Qwen3.6 27B, 5090 gives you ~3x speed over M5 Max, letting you plow through code, while M5 Max gives you ~4x memory, letting you use higher quantization and bigger context. Which would you choose and why? I've been doing a lot of research on this topic for a couple weeks now, but I still can't fully decide one way or another. I'm hoping to hear some other people's opinions on this, ideally from people who have used these hardware, for the type of work I plan to do.