I've been smoking a lot of FVF lately, and have been going back and forth between the tinned and bulk about 50G at a time. The tinned seems more refined, the sweetness comes through much more and it is easier to work with. The bulk is definitely cut thicker and has a more raw element to the taste and is less sweet, tasting chewier and bolder. I've noticed that the bulk tends to have much more crystalization to it (looks like bloom on a cigar, but is definitely crystaline in nature). They are absolutely different and both are worth cellaring.
Not in my case, but I don't buy the bulk very often. I also suspect that there will differences in bulks bought from different vendors due to time in stock and storage conditions. My limited experience (I mostly buy the tinned version) tells me that the taste, look, and feel of the tinned version is much more consistent than the bulk (duh!). In the past, it was the lack of uniformity of the bulk that turned me almost exclusively to tins.
This seems to be a common aspect to most, if not all, tin vs bulk comparisons that I've made...
My last couple of bulk buys (over a span of several months) came from smokingpipes.com and the stuff was quite crystalized, like it had a whole lot of age on it. A friend who smoked some of it thought it was some of the finest, funkiest FVF he'd ever smoked. I sort of like the tinned better, but the bulk is nice when something meatier is desired.