Which size and brand of curling iron?

Okay, so my hair is really thick and reaches down to the small of my back at it’s longest (layers). I’m finally breaking down to get a new curling iron (mine is 10 years old, snaggs my hair, and doesn’t get hot enough). I’ve got a Jilbere de Paris straightner, my mom had heard they were just as good as Chi, and way cheaper. I love it, works great. My sister has the Jilbere de Paris curling iron. Thing is I went into Sally Beauty today and I saw this Tool Science curling iron, it gets up to 500 degrees (and I kinda like the coloring better though I know i shouldn’t care). Both are ceramic, the same price, just wondering which brand would be better to get.

And also size. With my length and thickness of hair. My old one is 1 1/4 in and I like the size the curls are, but with my length, would it be better to have a 1 1/2 in iron? The Tool Science one only comes in 1″ or 1.5″ so I would have to go with the larger one with that brand I’d think, but maybe I should just stick with Jilbere de Paris since I know the size and brand??? Help