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

The user is seeking advice on choosing between an RTX 5090 and an M5 Max 128GB for agentic software development using Qwen3.6 27B locally. The RTX 5090 offers 3x speed, while the M5 Max provides 4x memory, presenting a trade-off between rapid code generation and larger context capacity.