Thanks for the feedback.
I much prefer chargers with separate power cables, rather than them plugging directly into the wall, and most GAN chargers from Anker and UGreen are the latter.
Looks like the Satechi at PB Tech ($148) is about the best value option at the moment for a grunty charger from a reliable brand.
The only downside to that one is it's got only USB-C: while most of our day-to-day charging is using USB-C, we still have a few devices that have micro-USB or Lightning, so will need to pick up either new cables or adapters.