Hi Mike
Of the two caves, LIC is the most comfortable (haven't slept in MBC, but it is clearly inferior to LIC) - good shelter, plenty of space, even some straw on the cave floor and some stone walls for (dubious?) shelter from the wind.
Both have very nice pools for swimming/bathing, but MBC is a bit closer to its water, and the Marble Baths could provide a bit more fun (you MUST ride the supertube! - photo below).
The only path connecting the two caves is via the Marble Baths Fork. One route which will provide some stunning views of the escarpment and visits to three or four valleys, would be to walk from the camp to Centenary Hut (via Fergy's cave - no camping allowed there), then along the contour path and down the ridge to LIC, then down the valley to Marble Baths Fork and up to Marble Baths (and the cave), and from there you can walk straight back to camp or follow the contour path to Grindstone Cave or Old Woman stream.
Of all the lower berg areas I have visited, Injasuthi is the most beautiful. It also has some of the most impressive stretches of escarpment in the berg.
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Hope this helped. Enjoy!