which I use quite frequently for specialised business purposes.
What are they like? They're great.
Better than Windows PC's? Not really, they're just different. People who use nothing but Macs tend to feel that they're better than PCs but that's probably because they never use a PC. Frankly there's little to choose between them in terms of usability, although you need to remember that Apple hardware tends to be much more expensive, and that not all software comes in a Mac version.
More stable? I haven't found that there's much difference there, either. You can crash a Mac if you try, just as you can crash a Windows machine.