Evolution of Marvel Studios logo on beginning of films and disc packaging

In 2008, we had the first Marvel Studios logo playing before Iron Man. That logo would go on to be used both at start of films and on disc art all the way through CA:TFA. Then for both The Avengers and Iron Man 3, they just put Marvel (not Marvel Studios) in front of the movies and on disc art.

Starting with Thor:TDW through Captain America: Civil War the Marvel Studios logo was brought back new and improved at the start of the films, but only the Marvel logo, (not Marvel Studios) was used on the disc art. Now there's a new Marvel Studios logo which will be used on Doctor Strange for the first time.

So I think this raises a few talking points such as:

1. Which is your favorite logo so far and why?

2. Why did Marvel put just "Marvel" and not "Marvel Studios" at start of The Avengers and Iron Man 3? [Both speculation and confirmed info welcome]

3. Why did Marvel stop putting "Marvel Studios" logo on box and disc art on all Marvel Studios films starting with The Avengers?

4. Which is your least favorite Marvel Studios logo and why?

My favorite Marvel Studios logo so far is the latest one that'll be used in front of Doctor Strange: I love the new epic music, the images from the films used in the logo and I think it just looks epic in general.

My least favorite, (although I still like it) is the one used in front of Iron Man-CA:TFA as apart from the Studios part, it looks too similar to the Marvel logo used in the non-MCU films.

Evolution of Marvel Studios logo on beginning of films and disc packaging