In Austria or Germany I never pigtail unless I encounter a seriously overfilled old-work box, for a very simple reason: box fill doesn't allow me to have any kind of connectors AND a device in a regular dephth 58mm box. If I have some old masterpice with more than 2 cables I don't have the coice, I have to pigtail because modern receptacles won't take more than 2 wires per terminal. I'd say that's a grey area then. In Germany it's worse since the standard box there only seems to be 40mm deep instead of the 50 we have in Austria. Deeper boxes exist, but are very rare, at least in Austria (haven't seen them in shops yet, except one very expensive electronics retailer with mostly German stock). Those 50mm deep boxes are barely enough to take a Schuko receptacles and 6 4" long 2.5mm2 conductors. Getting 9 1.5mm2 conductors + connectors + pigtails + receptacle in there is a major pain.
