This is a difficult one. I liked them all. I can't choose a winner but I can rank them.
1. Backstreet Boys.
2. NSync
3. 98 Degrees
4. Marky Mark and the Funky Bunch (I only liked one song from them eventhough I crushed on Marky Mark and still love Mark Whalberg(sp)
BSB was much bigger than N'Sync back in the day but N'Sync ended up being the ones with "staying" power. If N'Sync came out with a new album today, I think it would be big. BSB...not so much.
As for the real winner, none of them can touch NKOTB!