Well, if you ask me, every album they've made so far is good... or great actually
I LOVE the old school feel of the first album "Terra Incognita", it's so raw but it's sooooooo sooooo Gojira man...
After that, they started discovering their way to the sound of the newer stuff, on the album "The Link". It's fucking great, you can hear that they were on their way to "From Mars to Sirius" on that album. And as I said... "From Mars to Sirius" marked a new era in Gojira, mainly because they toned down the "extreme techy" stuff in order to play "less is more" type of stuff, and I am really glad they did that.
So, that's all of the albums they've made so far (well, exluding "The Way of all Flesh", and I'm extremely biased so I just love all of 'em. Don't ask me to recommend ONE album, because I recommend them all!
And then there is the REEEEEEEAAALLY old school stuff... namely, their first demo, which I happen to own
Limited edition! Even on that demo, when they were young and all, they rape most local bands... atleast in this town.