There are too many know-it-alls in this world. The comments people have made on your post support that.
As for the question, I think it depends on how the back end will be used and in what environment.
I have been in this business long enough to know that having a "favorite language" is foolish. There is only the problem and then the solution. Languages are simple a vehicle to solve a problem. The real mark of excellence is understanding the domain of interest in such a way as to plan an effective solution. PHP is good in some situations and Node in others. Whereas there spheres of appropriateness overlap somewhat, by and large they were created for different problem spaces.
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There are too many know-it-alls in this world. The comments people have made on your post support that.
As for the question, I think it depends on how the back end will be used and in what environment.
Do you have experience in both?
I have been in this business long enough to know that having a "favorite language" is foolish. There is only the problem and then the solution. Languages are simple a vehicle to solve a problem. The real mark of excellence is understanding the domain of interest in such a way as to plan an effective solution. PHP is good in some situations and Node in others. Whereas there spheres of appropriateness overlap somewhat, by and large they were created for different problem spaces.