Importance of Amplifier versus Preamp?


New in the field. I am wondering what is most important: a great amplifier with a good preamplifier, or a good amp, with a great preamplifier? Or should I look at a good amp with a great do certain brands make amplifier to go with preamplifier and receivers?
Thank you kindly.
rockanroller
Prior to my recent experience I was an advocate for the preamp having the most impact on the sound. I sold my Parasound A21 and listen to a friends Jeff Rowland 125 amp over the weekend. Despite having half the power, going from the A21 to the 125 was the most significant difference that I've heard. I submit it depends on what you currently have and what your going to determines how much impact the component will have on your system.
Zd542, I have a hunch that the op has been reading objectivist crap on youtube and other sites. I could certainly be wrong, though.