I have studied both languages. If your learning method is based heavily on reading and writing, then Spanish is much easier, because all of the letters in each word are pronounced the same, all the time.
French has many silente letters, and more complex rules of grammar, so French pronunciation is much more difficult to derive just from reading the words.
However, if you learning method is mostly orally based (natural method), then either language may be easier, depending on your mother tongue, as has already been stated.