I want to purchase MacBook with apple silicon. I will, sometimes, run Widows (for ARM) using Parallels and use an external monitor. Other times, I will use it for mobile and web app design. I will also run some spreadsheets. Should I purchase M1 Macbook Pro (with a fan) or M1 Macbook Air? Should I get 8 GM or 16 RAM? I plan to use this laptop for 7 years.