I like the Consumersearch website, as they take Consumer Reports, other review sources (like CNET for electronics), and
consumer reviews, and combine them all to make meta-recommendations.
On subjects that I have a high degree of expertise about, I would give Consumersearch a grade "B" for their reviews of the same subjects. Not 100% perfect, but always solid and reliable. It is where I always start my research when I am thinking of buying something that I know nothing about.
One note though, don't just go by their "top picks" on a given subject. Read the "full review" tab. That is where all the good information is. The "buying guide" tab has useful tips too.
Now, all that said, I just glanced over their pages for ranges/stoves, and I saw nothing about double ovens. I've never heard of them myself either. So you aren't going to find any answers to your question about double ovens there.
But aside from questions about double ovens, they'll likely be a good source of advice.