Overall, I don't think either group is that good.
The only people who have shown they can PROPERLY sing faster pop songs, along with ballads are Lucy (she was good in her solo for One Step Closer) and AJ.
And, no, Jordan doesn't have a good "singing" voice. She has a nice sounding voice - but it's NEVER in tune with the song. She just sort of sings along and hopes it works out.
Chantel needs to sing ballads, as seen with "Open Arms". Even though she still didn't pull that off too well, at least her nasaly voice sounded appropriate - and not scary, in that song.