The first thing I'd ask is what's the expected use case? Are you looking to use the scope while soldering, or is this for inspection of a board after it has been soldered? For inspection you can probably get away with a USB-connected solution. If you're going to be using this while soldering, you for sure want an optical instrument as even a small latency from a digital solution can be problematic, and you'd be far better off with a stereo solution as depth perception is hugely beneficial when working with small devices.
As others have noted you'll also want a pretty long focus distance so you have room for your hands and tools.
The bog-standard Chinese solution is the SZM series from a Chinese company called Ningbo Sunny Instruments Co, and is resold by Amscope and others under various names. For soldering and inspection use you won't be working at crazy-high magnification so I don't feel that having the finest Swiss optics is that much of a requirement, and thus the low-cost Chinese instruments will probably be fine for electronics hobbyist purposes and have the additional advantage of being very widely available with loads of options for things like cameras and stage lighting and barlow lenses or whatever else.