Hi. Well, I speak Portuguese and I think Spanish is very easy to read, but hard to understand when it is spoken because they speak very fast! Although both languages are very similar, and maybe Portuguese is a little harder because we have more types of sounds, like the \z\ sound or the famous \ão\. Sometimes these languages are so alike each other that you can get confused with some similar words, so I think that you should learn just one of them first. I hope it helps you, bye!