LAN, LAS, BR and RU cluster together at roughly fifteen percent below the NA baseline. All four are high-volume shards where accounts restock continuously, so you are rarely waiting for stock.
Brazil in particular has an enormous, aggressive solo queue. Games are short and fights start early, which makes it excellent practice for mechanics under pressure and poor practice for patient, scaling play. Russia's client defaults to Russian but switches to English from the login screen in seconds — that catches out more first-time buyers than anything else about the region.