Like most Magic: The Gathering cards, the value of Spatial Merging depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Planechase Anthology Planes)
And just like any sibling rivalry, its ultimately up to you to decide which footwear is better for your deck
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The former is great because you often get to do absurd things like put 1,000 1/1 tokens onto the battlefield in a single turn and kill off seven other players at once by sacrificing them all
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Ichor Rats is also a great way to infect opponents with a lot of blockers because it just infects all the players in the game regardless