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What makes Stone of Erech stand out compared to both of these is three things

Choco has an incredibly powerful ability that only requires that you attack with one or more Birds, so its ability can be used the same turn it enters if you have Birds already on the battlefield and ready to attack

For two mana, the instant made it so target player couldn't cast instants, sorceries, or activated abilities requiring an activation cost

Exiling a dragon and returning it to play gets around Rivazs anti-recursion exile clause, but in Rakdos your only reliable way to take advantage of that is Conjurers Closet

But if you're dropping enough land, you could be Proliferating four or five times a turn, and that's valuable