Science can get really complicated, and it's hard, plus you have to memorize a bunch of things.
Meanwhile in Math you just deal with numbers (except Geometry, although sometimes there is Algebra in Geometry) and you just have to figure out problems.
But then again this is my opinion, strongly considering that Math is my stronger subject, and that I'm currently failing Science with a 47. lol
I like Math more because it's more straight forward, whereas in Science you have to deal with theories, formulas, experiments, etc.
Again, just my opinion. ;3