I initially started staking with my primary account, but have recently started migrating tokens to a dedicated account for all my tokens (though keeping a very small stake on my main account for any unexpected curation benefits). This may be revisited in future as resources allow/demand, but for now I'll see how this goes.
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Same actually, although the stakes are small. As as well as unexpected curation benefits, your main account name can be in the top 20 list - a little promotion for this account.
I hadn't even thought of that little side benefit.