I haven't had a chance to compare 3ds and 3ds xl to the newer one. The new 3ds xl has a better cpu and better 3d. Since you have mentioned you didn't use 3d so it isn't a big deal. The only thing that would matter is that the new 3ds xl can play certain games which the previous versions can't, as Nintendo have said it. Not sure which games maybe xenoblade chronicles 3d. Not sure bout the list of games though.
If you think the newer version can justify your needs and your 3ds is old enough for replacement and you have money I'd said buy the new version.








