There could be quite a bit of difference in some sword users.
Shulk has the Monado, a futuristic sword that has a bunch of special abilities it can do. He would just be swinging the sword, he would also be using a lot of magic.
Isaac and Matthew both have the psyenergy powers, thus a lot of their special attacks would be magic and distanced based.
Isa and Saki both have a gun-sword. Thus it can be used as either a gun at longer rangers or a sword at closer ranges.
Every Fire Emblem sword user, for the most part, has access to other weapons and other abilities. Toss a bow or some magic, possibly an axe or lance, on them and it wouldn't just be about their sword style (which could differ as well).
Ghirahim has the ability to put away his sword or take it out, thus he doesn't always resort to it.Plus he can use dark magic for projectiles.
Takamaru would have a unique style in a samurai sword. Being a samurai he wouldn't always have to use it as samurais have loads of other items to use.
The same differences can apply to the likes of Prince Sable, any other possible Link, Lloyd Irving, Cress Albane, Sora, any Final Fantasy lead, etc.