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That's silly to be honest. I am a developer myself and I can tell you Mac Pro or iMac Pro is a waste of money in every way imaginable. Look up barefeats benchmarks. Unless you have very specialised needs (like video editing) there is visible penalty when you increase the number of your cores. For every day usage 6-8 cores is what you should be aiming at, and preferably with highest clock speed possible. The more core…
It depends on your needs. With Scala/Hydra I routinely run my 8-core i9 MacBook Pro to 100% for quite a few minutes. So I could definitely see more cores improving build times.
But from what I read (on barefeats benchmarks, no less) clearly shows that Xeon CPU is inferior for those use cases to fastest Core iX CPU.
To put it in simple terms, for peak loads choose Core iX. For heavy, long term loads choose Xeon.