I’m the market myself and find myself leaning towards Bonavita gooseneck (not sure if I need temperature control so I may go with just the straight-up no bells+whistles model).
The key / top criterion for me and B is that the kettle is all stainless steel inside. We both feel that any trace of plastic is going to leech into the boiling water, no matter if it’s BPA-free or not (which I think is just a big-time gimmick from manufacturers). We never microwave/put in dishwasher plastic of any kind and a recent guidelines from the American Academy of Peds bears out our behavior.
Scroll down to 2nd set of bullets, bullet 2:
https://www.aap.org/en-us/about-the-aap/aap-press-room/Pages/AAP-Says-Some-Common-Food-Additives-May-Pose-Health-Risks-to-Children.aspx
