Yes, FLAC is the BEST lossless audio with exceptional sound quality. But when talking about MP3 audio which has great sound ? CBR or VBRI prefer 24 bit flac. You'll notice the sound difference if you have good headphones along with a capable device.
PowerAmp. I am converting FLAC files to VBR/CBR Mp3Which app you using ? And whats your source for the music files ?