North America is the shard we restock most often, and it is the one most buyers land on. Queue times in solo/duo hold up at almost any hour, which matters more than people expect when you are grinding placements on a second account — a smurf you can only play at 2am is a smurf you stop playing. Every NA account here sits at level 30 with the ranked queue already unlocked at the account level.
The choice on NA usually comes down to whether you want to queue ranked tonight. Unranked Smurf is the cheapest way in, but the ranked queue stays locked until you have played ten normals yourself. Blue Essence Rich and Ranked Ready both arrive with those games already played, so placements are available immediately — the difference is 90,000 essence against 40,000. No tier has played a ranked game, so wherever you place is down to you.