Hi 1990,
As I've had B&O throughout the house as both of my children grew up (now 10 and 4 years old), I have given this lots of thought over the years. I ended up abandoning TV floor stands altogether and having a bespoke pine TV cabinet made by a local craftsman - this places my Beovision 8 up out of harm's way and also keeps the various set top boxes, games consoles and blu-ray discs locked safely away.
The TV feet are also clamped to the top face of the cabinet using concealed steel straps - this makes it almost theft-proof, as well as stopping it from toppling over if hit by an errant football or suchlike 🙁
So, to answer your question "Which alternative is more sturdy? A BV7-40 on a floor stand? A BV10 on an easel stand?" - my answer would be "neither, when hit at speed by a toddler on a tricycle".........
PS. I hope this post doesn't imply that my children are badly behaved, as they are generally very good. Some of their friends who come to visit, however, are a different story altogether 😠
Kind regards, Steve.