Hwayoung brings the group down more than Boram imo
A lot of fans still haven't warmed up to her yet and she scares off potential fans with her rapping. She doesn't seem to have much of a personality either! She's been in the group for over a year and I still know nothing about her, and this is coming from someone who watches all of their shows and interviews etc.
She could be useful in another group but not in T-ara! Her rapping is decent when she gets good parts but she's outshined by Eunjung and Hyomin who are both better at rapping than her. Boram's rapping is better than her as well (as proved by the performance of TTL they did at their showcase) so you can make that 3 actually! She's not the best singer in the group and she's not the prettiest either. She always has to wear kitten heels or tennis shoes (due to her being a giantess) too
She's not even that close with the other members (she's closer to the Coed members than she is with T-ara). Sometimes she reminds me of an ogre on stage, no offense to her.... She's just the definition of unnecessary
CCM even admitted that the only reason they put her in the group is so the other members could have more individual activities and she could fill a missing spot on stage. She wasn't even their first choice, they wanted her sister actually but Hyoyoung probably knew it was a bad idea (for her) and they threw Hwayoung in there instead. The CEO only picked them up after seeing them do
this on Star King a month earlier.
Boram on the other hand is cute and mature and has a pleasant sounding voice unlike Hwayoung even if it isn't the strongest in the group. You can tell the other members all love her and respect her and she does a lot for the group offstage. In Korea she's probably the most popular and recognizable member after the original 3 (all of the older fans Love her). She was actually a solo artist before T-ara but she chose to Abandon it all and join T-ara against her parents wishes whereas Hwayoung just got thrown in there by chance because she's "cute" and they needed a placeholder.
Their group dynamic as 6 members is nice and Hwayoung adds absolutely nothing to it