I'd rather use DMC Rebllion over DmC's because the latter provides too little protection for hands imo... And gawd if it hurts, being hit on your poor hands...
As for Alastor and DMC Rebellion... Mmh, I don't know, maybe I'd still go with Rebellion because Alastor never really caught my attention... But in general, since I started learning how to use a medieval sword, I came to like swords with a simpler design, because they are far more convenient in battle...
So, I'd go with Force Edge. Or better yet, Yamato. I love katanas.
Edit:
Oh, this obviously does not take into account magic-like abilities like DmC Rebellion's switch to different weapons and grapples. In this case, I'd surely go for DmC Rebellion.