Just putting this question in the room. I always had desktop PCs, just a year ago bought a 14" laptop because the 12" Android pads sort of disappeared from the market and iPad is too expensive, plus it has iOS.
Obviously 14" is a little bit small for darktable etc. So I thought maybe 15."?* - but then recently I plugged my 14" laptop to a 27" screen - and wow - a game changer! The 27" screen (plus a mouse and a keyboard) was perfect.
So I wonder if I actually need a desktop? I rather get a better laptop (I will stick to 14", got an i5 8th gen now), then with 16Gb RAM and possibly with Thunderbolt (external VGA potential).
Is there any benefit in a desktop? I know, it can upgrade, but I never really did that in the past. Just bought a new one every 3-5 years.