Which substrate would be best?

I am considering getting a leopard gecko in about a month and I have been doing a lot of research but I still have a few questions about substrates. I would like to use tile for the substrate and I have been reading about using ceramic, porcelain, vinyl, and slate and I was wondering which one is best? And which ones heat up the best? And I plan to get a temperature probe, I don't want the tiles getting too hot or cold. And when using an UTH, which tile would heat up with it the best? What substrates have you guys been using and what do you recommend?

I would suggest reading the sticky in the housing section on making the perfect leo set up. It goes into the pros and cons of all the tiles you are considering and will likely answer any housing construction questions you may have.