I was a massive NKOTB fan. I recently played some of their music for the first time since approximately 1990 and stand by that fandom. XD
Three days grace, imagine dragons, shinedown 
Some of my faves when I was growing up:

All-4-One
Backstreet Boys
Bell Biv DeVoe
Boyz II Men
Color Me Badd
New Kids on the Block
NSYNC
NSYNC was my #1 followed by BSB. there were other boy bands I listened to that popped up throughout the late '90s or maybe early 2000s? but they didn't get anywhere & I quickly forgot about them. even now, NSYNC & BSB are nostalgic for me so I'm still a fan. :B
I was really into NSYNC as a kid and I still listen to them from time to time when I'm feeling nostalgic. But I haven't really closely followed any boybands in the US since then.