IE 7 vs. IE 8. Which is better and why?

The first thing I noticed was that floats did not work in IE8 on the galleries that are standard with WP2.5.

IE7 on the left, IE8 on the right. Note that I have the random colors on each pageload option active, and the background color being different does not affect the rendering, nor is it a rendering problem.

Next, I tested the Slimbox (Lightbox but better). IE8 showed no signs of transparency, but IE7 worked as well as Firefox or Safari work with the transparency.

IE7 on the left, IE8 on the right. Also, notice that IE8 shows a scrollbar at the bottom. No other browser that I tested did that.

Next, I decided to see what the Admin interface would look like. I logged in. Small rendering problem.

IE7 on the left, IE8 on the right. As you can see, IE8 renders the log in button without making the blue box completely cover the back of it.

Once I logged in, I noticed that In IE7, the dashboard widgets rendered correctly. In IE8, they rendered one on top of another.

You guessed it, IE7 on the left, IE8 on the right.