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These are the sorts of answers I'd like, too. So much hype over this-or-that-coin and I've got very little idea what the differences are between them for the most part (except for steem, which I think is the prototype for a whole new curation-currency economy).

Well Steem is mainly used to fuel this site, while Dash is supposed to be used for everything. They want it to be a better Bitcoin.

I did already understand that. My question relates to the blockchain tech that are being used. As far as I understand it, Steem's blockchain can handle a very large amount of transactions...what about DASH?

I believe it can also. I am no expert when it comes to altcoin abilities to handle numerous transactions.