I'm not too sure because I wanted them to promote A'st1 more because they been in the shadows for way too long. I haven't been into Rainbow yet, so I'll just wait and see what they have to offer. I love all DSP artists so far, so I'm hoping I won't be disappointed by them.
Edit: And hopefully DSP will promote them well because SS501 and Kara took quite a long time to get where they are now. While artists from SM, YG, JYP, Cube, Pledis, and Mnet Media took less than a year to get such a stable fan base.