Very ambiguous question as there are many forms of Metal. Does this generic category include various forms of Rock music as well? I find Pop music to be very simplistic in its lyrics and its instrumentation. I've never been listening to a Pop song and gone "wow, that was an incredible guitar riff or solo, or said that drummer is incredible". They use a lot of sampled music, usually from Rock, drum machines and repetitive sequenced tracks. The vocals tend to use, and over use, autotune as well, in comparision to most Rock singers. The songs tend to be very cookie cutter in nature as well, verse, pre chorus, chorus , hook rinse repeat 3mins wham bam thank you maam. It appeals to the masses, hence its popularity, but by no means is it a superior form of music nor the talent as is required for Rock and Metal forms of music.
Its all a form of art, which is subjective to the consumer, so comparing the 2 is a discussion you'll never establish common ground on, just enjoy what you enjoy.