Which is the best speaker to buy ?

Out of you three, I would choose Von Schweikert. Other options Vandersteen Quattro.

What are likes and dislikes of your Forests?

I have never heard the 3910 but, Boa2 maybe be on to something. "I'd upgrade your source instead. I think you'll get more reward for the effort, and the rest of your system is already very good."

Your amp should drive Wilson Sophia or B&W 803D no problems. B&W Nautilus is the previous model. D series is new and better.

I don't think your amp will drive B&W N802 or 802D the way they supposed to be driven. So B&W 803D would be nice.

How do Totem Forest speakers compete with Wilson Sophia or B&W 803D?

I have a pair of Sophias and they were killer with an ARC VT100 Mark III that I used to have. I would think your amp would work well with the Sophias as they are a relatively easy load other than being a nominal 4 ohm impedance. I don't have experience with the other speakers but they are also highly regarded.

Consider Proac D25.

I heard these driven with your amplifier two days ago at the dealer.

I was very impressed to say the least!