I think I am a blending of several here. Buiding from ground up, I first place a masonary tile on the corners to know the property line. I use different colored masonary tiles to lay out rooms, size, location, hallways, bathrooms and such. I try to have the dinning room open onto a patio. I look a the property from all angles and work on having the best view for my sim and the chosen career, an artist needs good scenery; creature robot maker it doesn't matter. That helps in placing of the dinning area for the patio and the art studio if needed.
I add walls, then place furniture, generally having to tear down walls and resize to get the shape I want. It generally never ends up balanced, I focus on the shape of the rooms for their role; bathrooms, family room, kitchen, how do I want them created, shaped -- what type of furniture affects the shape of the rooms. In real life I would go with curb appeal, beauty and functional combined; in sim life, the inside is what counts.
Then I place doors, windows, lights and decide on the flooring and walls. Wood, tile, stone, paint, panelling -- what do I want? Last is the exterior, figuring out what siding do I want, what goes with the style that I ended up with, fits the location and appeals to me.
Landscaping is last, and is usually a couple of days later. I need to look at it, picture it in my mind what I want; formal, casual, nature, what style.
If I am moving my sims into a house already built I pick one that has the potential to become what I want it to. If the property is too small I move it. Then I start moving, shifting, adding and deleting walls to get what I want. That is based on what this specific family needs.
Key things I have learned that I see as important; a study where I can have three desks with computers, a bathroom for each bedroom and an extra bathroom downstairs. A small area off from the master bedroom that can be used as a nursey, no having the baby in the parents room, big mistake! Leave room for growth in the kitchen as later I will be adding a dishwasher and food replicator. Plan the location of the pool, it will be added later so make sure I leave room for it, and also an exercise room area. Will I be having a garden and what will I be planting?
Just as I have learned from reading here and getting tips, ideas, I have learned from trial and error what works for me and what doesn't.