I can think of four which I would consider the best representations of various styles and covers some different manufacturers (Wilson’s of Sharrow makes Fribourg and Treyer). Of course, just as with pipe tobacco everybody’s tastes are different but these are the ones that stand out for me.
Samuel Gawith Kendal Brown Original - Kendal Brown snuff is coarse, moist, and earthy.
Wilson’s of Sharrow Best S.P. - S.P. is the most popular style of snuff and this one has been made for over 200 years. Bergamot flavouring.
McChrystal’s Original and Genuine - My favourite medicated snuff.
Fribourg and Treyer High Dry Toast - Fine, dry, with a bit of nuttiness from the toasting process.
As for a fifth choice… There are so many more British snuffs out there in different styles it’s hard to recommend just one. Toque makes the best fruit snuff out there IMO so one of those would be worth a try. My favourite fruit snuff from them is St. Clements.
Mr. Snuff should have all of these snuff, mysmokingshop should have all except for the Toque.