Actually Runesword in FE6 is the same in FE7 but the differences is the hit.
What I don't like about Runesword is that its no better than a Nosferatu dark tome but for potential sword-users only. Runesword can't even get a critical at a near range whereas Nosferatu can in any situations. Runesword also have a use of 15...?! even Nosferatu has more use than that and its much easier to go to waste seeing as Runesword is not that strong. So its pretty pointless to use and Light Brand has more use as well. If any high-range swords other than Runesword or Light Brand, I consider Wind Sword to be my favorite just because of the effects against the flyers which is quite gruesome, it can also critical at a near distances kinda like Light Brand and it has the use of 40. Very useful. Plus I always like Aircalibur/Excalibur animations just because its much cooler than Nosferatu and Light Brand IMO.