Which is the best? A question that has plagued mankind for decades! :)
Prime:
A photographic lens where its focal length is fixed or unifocal.
Zoom:
A photographic lens where its focal lengths vary in a single lens.
When I first started shooting, I started off with Canon's 24-105 L f4 zoom lens. This is a great lens in perfect lighting situations; however, in low light, this lens gave me a hard time. Even with an external flash, or hot shoe, there seemed to be lots of grain and noise! That's when I realized that I needed something that would rage on even in the darkest of times! Ha! I had read so much about how fixed focal lengths typically performed well in low light, but I really never knew why! That's when I did my research, bought my first primes, and haven't turned back!
50 mm 1.2f Canon L Series