Eduard is more pragmatic, simply put. Easier to use, less frustration, with good choices of what to etch, in my opinion.
Aber etches almost
everything, a lot of which, in my opinion, is wholly unnecessary. Way over the top. And what they choose to etch (again, almost
everything!) is overly complicated, and very difficult to assemble. The frustration factor is very,
very high with Aber.
But, if you can get it together cleanly, the Aber PE is fantastic. In fact, even after giving the above opinion, Aber is what I usually buy.
The reason is I can choose what I think will benefit from being replaced by an etched part. If I think the kit part is fine (if it even exists!), then I have no problem not using the Aber part. You can build a pretty good PE spares box that way!
As for individual trax, aftermarket sets like Friul or Modelkasten are good options, but you can certainly get good results from some kit trax, too. I'm not familiar with the kit you have, but I've done several Dragon kits, and have had no problems getting good results from their link trax. You just have to deal with sink holes and other clean-up problems.
The key to any of them is just doing them, I reckon!
Good luck with whichever path you choose.