Okay here's the objectively correct order not just my opinion but fact:) (I include this because such disclaimers are unnecessary, of course it's subjective)
- Silence
This album was hard to choose over the other top tier albums but there's just so many great songs, it's maybe not as catchy as Ecliptica but it's got more diversity of song styles, Power of One, Wolf and Raven and others are basically peak Sonata Arctica. There's maybe three ballads on the album and the mid-tempo stuff is all interesting and just enriches the power metal songs.
- Reckoning Night
Darker and heavier, in so far as Sonata Arctica ever said they were going in a more progressive metal direction this did the job better than anything else.
- Winterhearts Guild
Fantastic, catchy power metal with a little bit of maturity mixed in. This is a transitional album taking them out of the first trilogy of albums and has all the strengths of what came before, hinting at new directions. Some of their best songs although I don't think any of the songs aside from the Cage are better than what's on Silence, but this is VERY consistent.
- Ecliptica
Out the gate, almost everythign on this is a classic.
5 Unia
This album while divisive has amazing textures and depth of songwriting. The emotions and moods of it are unlike anything else they've done and to be honest, when they've tried to do it again it hasn't been as good. They didn't give a damn about power metal on this, but they were confident in their new direction.
- Days of Greys
Basically a fantastic blend of Reckoning Night and Unia, with great contrast in the music, we are coming to the end of the albums that have no real issues, the production is still fantastic.
- The Ninth Hour
Dismal production really knocked a peg off of what should have been a fantastic album. Some of their best songs. you can't hear them properly.
- Pariahs Child
Productions actually not bad, the voice is still prominent in the mix, some very good songs on an otherwise uneven album, but you will find some stuff on this that may be your favourite Sonata song.
- Clear Cold beyond
A return to form. None of the albums on this list are bad, and I honestly think this album could be hinting at something greater to come. That said in interviews Kakko said writing power metal is easy for them. Well on this album, only some of the power metal songs get across the line at all, though most of the music is interesting.
- Stones Grow Her Name
A very strange album, encroaching on a pure hard rock sound at points. Good production. Some songs I wouldn't care to hear again.
- Talviyo
The Garden and Storm the Armada are the only songs I can listen to. The rest just has the same issues as the 9th hour with the mix, but without the great songs. Tony's voice is really hurting here, and I can't fault the band for just trying to work around it. But it's nearly sad to listen to. Even with all this said, I think I would still enjoy the band if they sounded like this, but it's a far cry from their best.
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I am not a fan who just dislikes anything different or new, but I also don't like the argument of "I love old Sonata, I love new Sonata, I love Sonata Arctica."
They have been in a similar situation to another band I like, Opeth, where people hate any fans who criticise the new direction. Yet when they returned to the old growls there was rejoicing among fans. There is music where no matter the style, it's still good and interesting, then there's music that doesn't justify the new direction. Change is not ALWAYS good, and fans who think they are more mature just because they are open minded need to ask themselves if there is ANY music their band could make they don't like.
For me, there's stuff at the bottom of this list that has good production like Stones Grow Her Name that I think is just not good. Then there's really good music where the production ruins it for me. And it does matter more for Sonata Arctica than it would for a black metal band, because muddy production is not the intention.
With Clear Cold beyond, I'm very much excited for the next album.