Choosing The Fujifilm X-Pro3
The most obvious reason you'd opt for the X-Pro3 over the X100V is if you want the flexibility of changing your focal length. And it's not even that you wish to own a large collection. Even if you're considering two focal lengths, prioritize the X-Pro3. This camera is paired with the 23mm and 56mm and makes for an excellent photography solution. The hybrid viewfinder is here on the X-Pro3, along with an original design that'll appeal to users that value that. The sub-LCD is not for everyone, but it makes for a unique experience in the field that'll cater to those that want to be in the moment when they capture.
If you're looking at photography as an opportunity to generate extra income, the X-Pro3 is a better option than the X100V. That is not the end goal, but the opportunity might be there. You have the versatility to choose how you see your world, working within the restriction of seeing it primarily through an optical viewfinder and doing so with a durable (i.e., titanium) product. I'd argue that the X-Pro3 better suits someone that looks to go beyond the hobbyist status. The idea of selling prints, portraits, or even events is not entirely out of the picture. With all this said, let's look at the Fujifilm X-E4 and where that lies.