I've just tried PlantNet for the first time. In the one case I tried it on, it seemed better than PlantSnap, which I installed a couple of weeks ago. There's a flower I've been wondering about for years. It looks very like a Forget-me-not, which grows in a number of places nearby and flowers at the same time, but has wider leaves. After quite a few attempts with PlantSnap, it came up with Chinese Hounds Tongue Forget-me-not[0], which sounded plausible. However, after a much smaller number of attempts with PlantNet, it suggested Green Alkanet[1], which I'm starting to think is more likely, e.g. due it flowering earlier and being more weed like. Not an expert, and I know this is only one test case, but based on this I'm favouring PlantNet. Looks like there will be fewer notifications too.
[0] https://www.rhs.org.uk/Plants/5194/Cynoglossum-amabile/Detai...