I really don't have a favorite. Every band on my iTunes is my favorite. If I had to pick though I would say...
2. Ozzy Osbourne
5. Either Halestorm or Five Finger Death Punch
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"For I am a sinner in the hands of an angry God. Bloody Mary, full of vodka, blessed are you among cocktails. Pray for me now and at the hour of my death, which I hope is soon. Amen." - Sterling Archer, aka "Duchess", aka "world's most dangerous spy".
This is really hard. I've been thinking about it for probably an hour now. To make it a little easier I'm going to current artists and exclude any local/obscure bands. Which probably pretty much eliminates most of my top artists/bands.
In no particular order (and altered to better fit the demographic that resides on this forum)
30 Seconds to Mars
Black Veil Brides
Kongos (more the style of music than the band but I can't think of anyone else right now)
Barenaked Ladies (kind of a cop-out but they were big when I was in middle/high school)
If I were adding local and more obscure bands the list would be
Bruiser Queen (Local)
Super Fun Yeah Yeah Rocketship (Local)
The Last Dance
Alice In Videoland (honestly I don't know why but I like them)
Honestly, I personally don't stick to artists more than songs. Some artists have songs I love, others have songs I hate. If I had to make a list heres what it would be (and it would most likely change).
3. Green Day
4. Breaking Benjamin
5. Toss up between two Youtube Celebrities, Lindsey Stirling or Alex G