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@gbj_tester
I've got a pair of RS30s. Compared with the others, they have bladed spokes (so do RS20s, but not 10s or R500s), and this combined with the shorter spoke to the deeper rim should make them best aerodynamically. The deeper rim is also stiffer, and the spoke bracing angle is marginally better than the shallow RS20. Against that, the straight pull spokes would be a pain to replace if they ever broke, so the R500 with plain guage j-bend spokes has that going for it. I've had R500s in the past and they are sound, albeit basic.
Depending on what you're using them for, it may weigh against all Shimano wheels that they don't have cartridge bearings, and Shimano's so-called seals are nothing of the sort, so they are not ideal for an all-weather daily driver. Merlin have Aksiums for £126 for account holders, which is my choice for all weather use (I've got them on my winter bike), but for racing the RS30 is probably faster.