Since you already have those Roden kits I'd say: keep 'em! Because:
1. Eduard's and Roden's offerings are not exactly the same. Not yet. Eduard's first D.VII kit is late and and mid OAW, not yet available as Roden kits. They have announced the mid OAW, but the late OAW may never come. They did not include this production variant to their 1/72 line of D.VIIs. And the other way around, Eduard has announced, IIRC, to kit six production variants all together. Some of the Roden early types, like the early OAW, might not be included.
2. You might like to do a model with the engine cowling partly or fully removed. Roden kit is definitely better for this option.
3. You might prefer very smooth wing rib detailing. Roden is better in this too.
4. Yes, Rodel decals are poor. However, for Fokker D.VII there is some aftermarket decals (The situation with quite a few other Roden kits is more difficult. ). You paid much less for your Roden kits than you'll have to pay for the Eduard kits, so you kinda have some extra money to invest for the aftermarket decals.
5. In Eduard D.VII kits there are parts for two full fuselages. You might like to try to use the extra fuselage with a Roden kit, to avoid the reported fitting problems of Roden's own nose parts.