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I'm not sure how much it is on Steam but I just heard that it's on sale this weekend on the eshop for $5 which is a pretty good deal. I'd say just pick the platform you like more/think you will play more for this.
While the 3DS version doesn't have the level editor, it does come with several noteworthy bonus levels from the level editor that are quite good. If you choose to get the 3DS version, I recommend getting it this weekend. It's currently on sale for $5 instead of $8.
I personally like having it for 3DS, for the portability, D-pad, and ability to "pick up and play" it at any time.
[Dark Spirit, Spirited Wind + Severstarr] -- Someday I will ragequit life. http://i.imgur.com/2Hqmd.png