The change from the earliest BoM releases to the latest releases are most evident with the British regulars ---- the quality and painting on the later releases is much higher than on the earlier releases. Actually, there is a huge difference at least among the British and French --- so much better in the later BoM releases. Later ranger releases are much nicer than the earlier releases.
The appeal of any Indian piece is per individual taste - my favorites are scattered throughout the entire history of the releases, but I must admit that all the Snowshoes Indians do seem to be outstanding.
Looking at RR-30 and RSF-14, these would rank high in appeal. Larry is correct in that the all mounted releases are very nice indeed.
But as I have said before, John's WWI pieces, especially the French, may represent his best work.