I have a mix. The aga like range is fixed, and does the ch, hw and cooking. I have a run of fitted units under the windows, do drawers, dishwasher space, cupboards and pan drawers (and butlers sink), the the other side of the room I have my fridge freezer, a triple cupboard I use as a pantry and Le Creuset/bakeware storage, a couple of freestanding central islands, then as you move down the room, I have my dining table, one side an old massive fireplace that houses the booze, an alcove for shelves or a cupboard, then the other side, I have an old set of victorian school cupboards that house all my glassware, posh crocks, and a plate rack/dresser that holds all my everyday crockery.
It works for me, and hasn't been a problem when we let the house. I took the triple cupboard, dining table and school cupboard when we moved abroad but left the central islands and the plate rack. we have a totally fitted kitchen in our rental abroad, but I miss my unfitted kitchen. I am vertically challenged, so having top cupboards is a waste of space and time for me, and the freestanding stuff I can move around as I please.