Apologies: I'm aware that I am both new and talkative, so I will try and contain my enthusiasm...
In SA I would be keen on both the All R3 and the Slant sets.
I really want all R3, however I am intrigued by the idea of the R3 lower plus slanted upper rows. I've not seen that before (although that's not saying very much).
Or, if it's offered with Slant as primary, and All R3 is available only via an all-in-Ergodox-&-R3 kit, well, that route is OK too. Whatever is most likely to get up.