If you had to choose ONE: RTX 5090 Workstation vs DGX Spark (or 2-node cluster) vs MacBook Pro M5 Max 128GB for AI development?

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I’m planning to buy one machine that I’ll use for the next 4–5 years, and I’m stuck between these three: Option 1 • RTX 5090 (32GB) • Ryzen 9 9950X • 192GB DDR5 RAM Option 2 • NVIDIA DGX Spark (128GB unified memory) • Possibly a 2-node DGX Spark cluster in the future Option 3 • MacBook Pro M5 Max • 128GB unified memory • 8TB SSD My work is focused on: • Local LLMs • AI agents • LoRA fine-tuning • Computer vision • Medical imaging • RAG • PyTorch • CUDA/MLX • Building