A/B testing ideas: Conversion rate comparison?

I am currently trying to find ways to conduct A/B testing for conversion rate analysis. To give an example:

Consider an ecommerce website. What I have is following situation - I have two Landing pages LP A: 5000 visitors LP B: 6000 visitors

Converted in LP A - 10 Converted in LP B - 15

What I want to test is if conversion rate in LP A is significantly different from conversion rate for LP B. I have tried t test of proportion but I was looking for something else. Chi square is also an option but are there any other better ways?