Wow she has a very weak singing voice. Compared to the other pop girls her singing voice is trash and I'm being 100% honest
Her raw voice is actually quite deep & powerful - But she has come to be known for her whispery & breathy vocal technique, which doesn't sit at her natural register at all.
Her live performances are better than any Katy or Kesha live vocal performance that I've seen - & Miley's voice live is grating, off-key & out of tune most of the time. Britney may not have great control or vocal-prowess, but she is more than capable of sounding sweet, vulnerable, angelic & serving a decent vocal performance.