I your husband is definitely a keeper!!

))
I have the B30 and don’t find it too heavy, depending what you put in. I have seen the B25 at the boutique and it’s much smaller - it always shocks me how small it is in real life. It always looks bigger in videos and pictures. Similarly for the B30, it’s smaller in person. Maybe they might have the two in the back to show you the difference. Sometimes they have bags that are allocated to others but they might be willing to let you see them (if they have already been opened/taken out of the box that is). The handles on the B25 are so small that you may not be able to put your hand through - but that doesn’t always matter to everyone.
I would say the LV Cappucine bag might be heavier than the B30? It’s been a while since I’ve held one but my memory is that it has substantial hardware and thick leather.
I hope you get your bag soon!!