Although I have a linear PSU, I am thinking of getting a new PSU to complement the one I have. Although I mostly use QRP, it would be good to get one that will power a modern 100W rig. I think this means one that can run 25A without overload.
SMPSUs tend to be smaller, but can be noisy both electrically and because they tend to have fans. Linear PSUs tend to be larger, but often don't have fans.
At the moment W&S are offering a special deal on a linear PSU with a 2 year warranty.