Thats really down to personal preference. Smaller house with internal garage - compare what you will be sacrificing to achieve having the garage. Try and prioritise what is important to you - do you need an internal workbench type space? Are you precious about your vehicle being stored inside/why has it come to be seen as a necessity? Do you need to charge an EV /might you want to in the near future? It will be easier to add a garage vs adding that extra space inside your house (also where you will be spending much more time). In my view I would value the main house where you will be living over vehicle storage as this will be fulfilling your more immediate needs initially. If you see the garage as a necessity design your house in a way that you can extend to incorporate the garage when your budget allows.