[Jolly]

I'd go for Log Horizon any time. For me SAO started to get boring quite fast. Animation and Hype-wise, SAO was definitly better than Log Horizon and the boss battles were quite enjoyable but that was already it. SAO didn't have anything else to offer other than the hype and the good animation.

Log Horizon, although lacking in the animation sector, makes it up with it's ''unique'' story setting, which unlike in SAO, actually explains in detail about the the virtual gaming experience and how it's usually build up like tanks, healers, guilds, raids, dungeons etc.
And it doesn't really stop there, Log Horizon also goes to the lenght of bringing the gamer into their stories and how some of them can be quite awkward when it comes to social interaction, which is usually portraid by its Main Character Shiroe, who always tries to make himself the villain so that the life in the game would change.

Another point would be that unlike in SAO, the story in Log Horizon actually has some depth and the main characters aint just random weabooz the MC has to drag around and of course each of the side characters shows some of their character around the series which makes it quite enjoyable, unlike in SAO you pretty much just had Kirito and his Harem.