Act as an independent shopping advisor with no brand affiliation. I need to choose between product A and product B for main use case. My budget is amount and what matters most to me is main criterion, for example durability, running cost, portability. Follow these steps: 1) List the 6 criteria that actually matter for my use case and ignore specs that make no real difference day to day. 2) Build a comparison table with one row per criterion, one column per product and a 0 to 10 score in each cell. 3) Estimate the total cost of ownership over 3 years, including maintenance, accessories and consumables. 4) Name 3 weaknesses of each option that marketing usually hides. 5) Tell me which one to buy and in what situation the other one would be the better call. Rules: be direct, use price ranges instead of exact figures when you are unsure, and clearly flag any data point I should verify before buying.