It's an interesting question! Both are clearly red tracks, they're kind of divisive, and in both cases, the girls seem to be having fun with the oddity of the songs. 
Let's find out what people like more~
i think i may need to give birthday a few more listens to completely decide. i like it but it may grow on me more later like zimzalabim did 
so for now im picking queen zimzalabim
zim za la bin zim zim za la bim zim zim 
Zimzalabim is the only Red Velvet title track that I dislike. I like Birthday. 
zim za la bin zim zim za la bim zim zim
Zimzalabim
Birthday and it's a good song despite what many say
i think its too soon to tell
zim za la bin zim zim za la bim zim zim
zim za la bin zim zim za la bim zim zim
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