Well the Pentecostal and charismatics are almost unit in the question of the baptism with the Holy Spirit and the sign of speaking in tongues. But it the theology you can find all denominations and directions. F.e You can find calvinism teaching and menonite teaching, which is contrary to each other.
The Pentecostals and charismatics often dont agree with each other teachings.
You can find those with a serious, biblical teaching and those with unserious and non biblical teachings. From far right to far left.