I have an option to pick either one but I don't know the difference and it all seems the same.
They are all the same – just said in a slightly different way! I think "voice" lessons and "vocal" lessons just sound a little fancier!
I offer "voice" lessons and in them we learn how to breathe correctly for singing, how to use your voice so you don't hurt your vocal cords, how to support your sound, how to pronounce vowels, consonants, words in different languages, how to learn a piece of music, and many other things. As long as you know what the teacher offers and that's what you want to learn, then pick any of the choices offered!
Good Luck!