Hoppdoc, the "BEST" designation is simply the top of the line of any maker, and is simply the same rifle as their regular rifles, but far more attention is taken with detail. The wood is tops, and the hand work is very well done. Decoration is usually VERY well done. In some cases these rifle are even boxlocks with side plates, but not often. As 500Nitro says, most are true sidelocks, and of course the price is much higher!
As an investment, these are the one that aprecieate the most, but they kill Buffalo no better than a well made, but less refined double of the same chambering!