I like them equally to be honest... pending what the change is.
Adding some parts during canon episodes is nice...
EX: Pain vs Hinata made the scene nicely more dramatic, but also further implemented how many ****s Pain didn't give against her. Also with a recent one, showing Neji buys leading a squad (as a Jounin!!!) it was a nice addition.
Adding some parts during canon episodes is bad...
EX: Hinata throwing her arms close together as the Kumo-Zetsu (who were origionally jumping down at her) as opposed to having been busy fighting multiple opponents.
If they aren't being retarded, Filler Arcs are fantastic! I'm a fan of the Guren Arc compared to many! I really liked many of the Filler War Arc episodes that revolved around fighting Edos.
At the same time they can be bad... while it was good to see them, the animation team made the 7 Swordsmen look like overrated Douchebags.
Kushimaru and whomever he was with looked like absolute fools when they got beat by bumping into one another... top tier shinobi just don't do shit like that!
For the most part I enjoy them both, but they have some faults.