Every business which needs a service to just basically receive their phone calls gets confused whether should they go for an IVR or for a Phone Answering Service.
Deciding which is better of the two isn’t as easy as it seems, because you would get a list of advantages and disadvantages for both the kinds. If you surf the internet, then typically you would find that those articles which favor IVR are posted by IVR service providers, and those articles advocating call answering services are typically written by its service providers. So essentially these articles are written to further vested interests!