I share my personal experience because I think it is relevant to the OP. My first piano as an adult was a Yamaha U1. It was a very good piano; not new, but very well serviced. I didn't have any issues using it, but as I spent time playing it, I found that I wasn't actually drawn to its sound. I even had it voiced more to my liking.
Working in the business, I had the ability to exchange for a different piano that was to my liking without much cost. The piano I changed to was a May Berlin M121 (selected by Schimmel). It was a lovely piano that suited me very well. No, it was not better than the U1 in all areas, but it had a fine action and tone that made me want to play it. My time at the piano increased and my skill was improving. 5 years later, I also sold it quickly because it was young and good and sounded fantastic. I thought I was getting a grand at the time but my plans changed last minute or I would have kept it.
While a B3 may have better resale value than a Fredolin Schimmel, we've not found the resale of the B-series to be exceptional (whereas I admit in most markets, the resale of the U1 is exceptional). But then if you spent 8 years on a Kawai digital, are you really concerned with near term resale or daily enjoyment. If you're selling the B3, either it's a sad day or it proves that it wasn't the best choice for you in the first place.
If you had preferred the B3's tone and touch, then I would recommend that. But in my experience, even a moderate preference for a piano's tone during the audition will ultimately grow as you spend even more time with the piano.
Nothing wrong with taking a little extra time to consider and, if possible, expand your search, but trust your own ears and fingers. In all the posts above, the B3 is regarded as a sensible, fair, but not glowing choice. There aren't as many people who will have played the recent Fredolin Schimmel's who can fairly comment from their personal experience, and Fredolin owners might not be here on this forum to reply. Actually, I don't see a rush of B3 owners here defending their personal choice either...it's a well meaning example of popularity feeding on itself...substituting the known (even if it represents a compromise) for the unknown in the eyes of those that choose to post...not a sampling of B3 and F123 owners.