Tristan, This is my profession of 30 years. You rely primarily on short lenses for architecture with plenty of coverage. Try to find a camera that you can use a 47mm without a recesed board. If it can handle that it will work for any possiblity. I used a flatbed for many years but the bed is an inconvenience with wide lenses. So a rail camera generally is the best choice. There are a few out there that will handle a 47 on a flat board, the Arcas I believe do. My choice? You won't believe it. A modified Calumet Widefield. For the first 10 years, I used a Tachihara as a stringer for Architecture Magazine working all over the west. For the past 20 I have used the Calumet. It is not quite stock and I have rebuilt it completely about every five years. I will try and post a picture of it with my modifications later this week. I also carry a Hassleblad for long Lens shots because they don't need perspective correction.
For the past few years I have primarily shot roll film, as I got really tired of loading sheet film in motel bathrooms on extended trips. I use Calumet C2N 6x9 rollfilm holders, which gives me lower film costs. I've never had a complaint from clients I used to shoot 4x5 for. I only shoot 4x5 for my personal work and a few very picky national magazine clients. I carry the following lenses: 47XL, 65, 90, 120, 150, 210, 305. The 65 is the most used lens for 6x9, the 90 for 4x5.
For the past couple of years, for clients who only need digital files, I have shot Fuji 160S color negative film and scanned it in house with various scanners, currently an Epson 750 Pro. If you know what you are doing color negs scan beautifully with a long tonal scale that leaves you plenty of dynamic range to play with.