As regular practice when silver gets in the low $16's (or less), I usually pick up at least one of all of the staple silver coins (American Eagle, Maple Leaf, Libertad, Britannia, etc) for that year so I have at least one of these coins from each year. Call it OCD or silver stackitis or basic diversified portfolio practice. This go around I saw 2 different Britannia's that I wanted to add.
2017 - 20th Anniversary Britannia
**Nothing too special, does have a small privy with "20" wrapped around a trident on the reverse of the coin (bottom left). 120,000 minted coins so a little on the lower side but still plenty available in the open market so not selling like hotcakes right now so might not be worth the $4/ spot but still had to get one to add to the pile, especially since these Britannia's don't usually have any alterations from the main design.
2018 - Oriental Border Britannia
**Again nothing crazy special but does have an Oriental Border on the reverse of the coin of which was inspired by the Chinese-themed rooms found within Buckingham Palace and the Royal Pavilion in Brighton, United Kingdom. 100,000 coins minted and above $4/ spot. It is noted that this is a "one-time" design with the Oriental border so not the "first" of many. Not sure if this has long term ROI but maybe with the long history of British and Chinese relations especially in trade and coinage, maybe a good addition but only time will tell.
So for a few dollars more for each of these different coins, it does change up my Britannia stack little and gives a nice diversification in regards to the design. Hopefully they don't have multiple "alterations" to the staple coins every year and keep these classic ... but nice to sprinkle in a new design every few years or so :):):)