In the playtest group we had two val'Virdan Sword Sages weilding Greatswords / Flamberges in addition to my dagger specialist. I didn't find either build noticeably better than the other and when we did bump into issues we got them corrected.
There are several things that end up balancing...
As someone who has played the new system quite a bit at this point I have been very impressed with the CSE RPG for a wide variety of reasons.
1. The rules are very flexible to support building a character concept from a wide variety of angles. I have taken concepts and spun the exact same idea...