How would you rank Freddie, Brian, and Roger in terms of vocals and why?

Yeah, that's completely and utterly wrong T.T

Honestly for me Freddie and Roger balance out, but Brian wasn't as good live(with standouts such as stl at mk and fts at Portland)and was imo a bit better in the studio

Freddie was the lead singer for a reason.
Roger and Brian voice abilities were good but not close to Freddie's.
It's not the same to record in the studio, sing live back vocals or be the lead singer during the tour.
He was able to do it,they are not.

What about John? :-(

I guess he was never very vocal...

Freddie, Roger, Brian. Roger beats Brian on a technical level, but really they're pretty close I think. Roger does raucous really well, Brian does tender and warm really well, but Freddie beats both of them in both categories.

Tim Staffell's probably technically about the same as Rog, though his tone can be grating at times.

It's interesting to think about whether John could have been a could singer. Certainly he wasn't one because by all accounts he never gave it a serious go, owing to his belief that he was no good at it. But evidence shows that anyone can learn to sing in tune - I'm sure if he'd had the confidence in his own voice, and the desire to learn, he could have been at least a passable singer, if perhaps a bit nasaly in tone.

We also have to take into account that our idea of his singing ability comes only from recordings where his vocal mic wasn't meant to be turned up. Hearing these recordings, we tend to assume that he struggled to sing in tune. But that's not a fair assessment, because in those recordings he was almost certainly unable to hear himself singing - most people would sing out of tune in that situation.

Mercury, Taylor, May.

On the fact that Taylor is considered the first backup singer to May.

Freddie, Roger, and then Brian.
Freddie's voice is phenomenal, not just because of the range, but because it is extremely 'likeable' (very tepid way of putting it, really), and attractive, and changes timbre according to the song. Even people who dislike Queen (yes, they exist), like Freddie's voice. You can listen to Freddie singing all day long without tiring.
I love Roger's singing because it is unique and passionate and completely suits his songs. And I love his screams (My Fairy King..)
(I think one of my Queen favourites is 'Rock It Prime Jive'. It combines the pure beauty of Freddie's voice with Roger's unique style.)
Brian's singing on the other hand is very bland and boring. I usually fast forward any of his songs (not compositions, just when he is singing).

Oh...

1. Mercury...no discussion nesessary here

2. May..really his input to the backing vocals is underrated imo

3 Taylor...his style works good on live tracks...in studio not so much, but still okay.

4. Deacon...you know his quote about his own skills on mic...don`t you :)

Did Brian May ever sing live at a Queen gig (proper Queen not plastic Queen bollocks)? His mic was actually a potato.

Since no one is speaking objectively I will give my opnion:
Roger has the broadest vocal range, he was always in charge of the keynotes in Queen's vocal arrangements. Following this same line is Brian, with a medium voice but almost as sharp as that of Roger. Between them two, in that combination we have these choruses so characteristic.
     Now, Freddie has the best damn voice in the universe but his record though extremely broad did not reach the peaks of the other two so hard, but it's a beautiful voice, with a lot of force.
     Putting together that amalgam of timbres is that Queen had that sound ...
     I hope my analysis has been useful

Since no one is speaking objectively I will give my opnion:
Roger has the broadest vocal range, he was always in charge of the keynotes in Queen's vocal arrangements. Following this same line is Brian, with a medium voice but almost as sharp as that of Roger. Between them two, in that combination we have these choruses so characteristic.
     Now, Freddie has the best damn voice in the universe but his record though extremely broad did not reach the peaks of the other two so hard, but it's a beautiful voice, with a lot of force.
     Putting together that amalgam of timbres is that Queen had that sound ...
     I hope my analysis has been useful

Roger had the voice required to be a successful singer.

Some of Roger’s lead vocals (I’m In Love With My Car is a specific example) leave a lot of other high profile singers in the shade, and would be massively lauded if they been performed by, say, a Roger Daltrey or a Steven Tyler etc

Brian’s voice perfectly suits the tracks he takes lead on (‘39, Sail Away Sweet Sister, All Dead, All Dead etc), but in reality his voice is more that of a backing vocalist taking lead on a few tracks (which is not an insult).

Freddie? Well, you just have to listen to You Take My Breath Away, Love of My Life, Radio Ga Ga, Let’s Turn It On (acapella) etc etc to realise he was unmatched.

Freddie Just might be the best overall Rock singer of all time, Versatile singer he was. Roger and Brian Is close. I like Brians voice on the softer songs like 39 and Good Company, while Roger was really good on the rockers like Modern Times on the first record. I give Roger the edge as a singer for those high notes and the ability to sing hard Rock and ballads as well. Brian had more of an impact on his Guitar over Roger as a drummer, but that's another topic. Freddie, Roger, Brian for me.