Are there other languages, apart from those in the indo-european and semitic language families, that have synthetic-fusional morphologies? It seems that the synthetic-agglutinative morphologies are much more common (eg. uralic, altaic, caucasian, basque, hurrian, sumerian, etruscan)
The WALS website enumerates and classifies some languages having a fusional morphology: https://wals.info/chapter/20.
Still on WALS, some statistics are given about the degree of exponence of a few languages: https://wals.info/chapter/21
Indeed, from this sample, it seems agglutinative morphology is much more common.