It is difficult to answer the question the way that you asked it. I use individual effects on many tracks, but then I put a little bit of the same reverb on the entire mix to make it sound more cohesive. Convolution reverbs are great for doing that.

Yes.I like them both equaly!!
I Like the deferent colors of the deferent reverbs,but also LOVE the accuracy of the same reverb on every instrument/voice.More realistic I guess.

I will use a common reverb intentionally, to make things sound like they all happened in the same acoustic space. BUT .... this common reverb doesn't necessarily have to be just one single reverb. Some interesting and complex sounding reverbs can be created blending more than one reverb together. Don't limit yourself with verbs. There are many approaches to ambiance management. Try sending the signal out to a live room and micing that up and then sending that to the verbs ...