Generally speaking, FT materials are slightly better than the non-FT same product (this applies to Jia tuo and mushrooms). The difference is bigger in some years (not announced by xiaguan but totally depending on drinkers' rumors). Baoyan bricks are made of the debris and left-overs of various things and have lower grade leaves than mushrooms (which has low grade leaves to begin with). But the face material is quite presentable (as showed here: http://gingkobay.blogspot.com/2010/01/2006-xia-guan-bao-yan-brick-sheng-in.html
). Some say you could buy bricks and cut the face side off to get the best value of your money
In some years FT mushrooms (and its series) are less smokey than regular mushrooms and therefore disliked by traditional-flavor lovers (and probably favored by other people). Otherwise many people would prefer to FT version.
I've found all these lower grades aging faster than many products made of higher grade leaves.
Overall traditional xiaguan style is totally a different genre from the big tree tea products. But some guys tried to use the style on big tree teas. Quite a few 2006-2008 period teas made by some famous Taiwan producers are of the "fusion" style.