Rancos/Johnson/Helix are all great but nobody holds a candle to Herpstat. They are just plain better in every possible way and there isn't really any arguement to be made against that.

If you just have a single boa/bp then yeah a ranco will be fine though. I had a repti temp 500R on my BP back in the day and I can't remember having a day where I didn't have to mess with the temp. I ditched it after I was gone from the house for 3 days and I came back to a 83 degree "hot" side. Moral of the story, bare minimum is an on/off digital unit like a Ranco/Johnson.