That's pretty subjective. That's like asking which color car looks like it goes the fastest. Corian Raincloud looks the most marble like to me, but I kind of shy away from non-technical questions.

I think their are a few good contenders. Some have a more cream background and others are more white. I chose LG minuet. I posted a few photos but here is one of my island. I liked that the LG had a white background. Go to a fabricator that carries a few different brands and compare them side to side or order samples. Here is mine. I am very happy with it and it cleans up nicely.

We have Rain Cloud. At the time there were fewer choices than you have today. My advice is to know that "Not Carrara" will not look like Carrara. It will have a look of its own. We like the fact that the Rain Cloud has tan in it and is a little softer white than the real thing. It actually works with our cabinets and flooring better.

Some you can look at in addition to the above are:

I don't think any of them will fool you as marble, but the coloration and "idea" is similar.

Silestone: Ariel, Helix

Zodiaq: Snowdrift

Caesarstone: Frosty Carrina, Calacatta Nuvo

Cambria: Torquay

Or, depending upon the situation you could look Fiandre extra large format tile

http://www.granitifiandre.com/porcelain-tile/marble-effect/

Search for kompy's kitchen. She has one that looks the closest to me. I think it's called lagoon, but I cannot remember the brand.

The two I felt closest were LG Minuet and Zodiaq Coarse Carrara. I'm going with Zodiaq Coarse Carrara but I don't have it installed yet. I did see a large slab and I took my sample to compare to real carrara marble and felt it was a good match.

I went to my local home show where I was able to see dozens of companies samples as well as some suppliers. It really will depend on what you like so it's best to go where you can see most of them before you decide.