Ended up killing Uber elder 12 times this league. In that time I got 2 watchers eyes , one garbage and other about 1ex, and a couple i86 shaper or elder items that were worth 1-2ex. Previous to this I was just farming a t16 elder map. Comparing the two, I easily oversustained my elder map, got tons of other maps from it , and made lots of currency in small chunks from selling shaper/Zelda items. Doing guardian maps to chain Uber, I wasn’t close to sustaining even with using red sexrants on every guardian map, and didn’t net anywhere close to a return relative to the cost of the frags(only reason was even close was from some lucky shaper drops like dying sun).
I get that the choice should be dictated by what you enjoy doing more, but with the rng spikyness of this game it seems the rvr on Uber elder is way off; it is way more consistent and reliable to farm t16 elder maps to make money. I guess the result can get easily skewed by a 25ex double clarity watchers or something like that but in general some more consistent rewards from the last fight in the game (and which requires so much currency investment) seems called for. Going on their theme of connecting diff parts of the game with div cards, maybe something like that mortal frag being a common drop from Uber elder would be a nice start