Porro prism is cheaper then roof prism. Roof tend to be smaller binos.
I have had excellent success with Bushnell and Wind River (Leupold) binos. Personally, I use a 8X42 Wind river binos for reg. still hunting. They have worked very well.
For more money, you want to look at Steiner. They are very light for their optical power and optics are great.
In fact, I am looking at upgrading my Wind River to a Steiner. If interested, let me know. firstname.lastname@example.org