What is the difference between the iPhone 6, the iPhone 6 Plus, the iPhone 6s, and the iPhone 6s plus?

I just now found out that the iPhone 6 and iPhone 6s were two different phones so that makes for 2 other new phones I learned about what are the differences? I'm thinking of switching from my Samsung 6 to an iPhone 6.

If you're thinking of switching to iPhone 6, it doesn't matter what the differences are between the others - you're not considering them.

If you still want to know, you can go to a site like gsmarena.com

The Apple web site (apple.com) has a comparison of all it's phones. I could read it and repeat it to you here -- but I don't want to.

Could compare them at GSMArena.com

To make a long story short the 6s vs the 6 was faster, better internals, etc.