For my house I have medium pile carpeting in the hall, low pile carpeting in the upstairs hallway, berber in two of the bedrooms, medium pile carpeting in my sister's bedroom.
The Filter Queen would always be a good option. I have never liked Hoover tools....Filter Queen offers much better tools with horse hair bristles. The power head may not clean as well as the Hoover, both would have good air flow....I would choose the Filter Queen based on the tools.