Best convertible car seat?

I'm really struggling picking one as the ones I like - britax advocate, nuna rava, peg perego kinetic, cybex sirona all have what appear to be great safety features and other good features like ease of use and breathable seats but seem to score really low on crash tests compared to the cheaper seats like the graco extend2fit which doesnt have the features like breathable seats or anti rebound bar that I like. Anyone have a good convertible car seat recommendation that has great crash test results and well as the other awesome features.