Which language is easier, French or Spanish? ...they're about the same

Aujourd'hui, entre 320 et 400 millions de personnes parlent l'espagnol comme langue maternelle, faisant d´elle, selon les sources, la seconde ou troisième langue la plus parlée au monde comme langue maternelle.

There's a pretty interesting article here on about.com that goes over the two languages and concludes that the two languages are generally about the same in terms of difficulty for an English speaker, and I agree with the conclusion. Basically it says that:

• Spanish is easier to read and pronounce at the beginning, French not so much
• French has easier conjugation and uses pronouns in a manner more similar to English, Spanish drops pronouns all the time and has more complex conjugation (although French has more irregular verbs)

and then some more about syntax. I would also add the following:

• French vocabulary is closer to English vocabulary to the extent that sometimes you can get away with taking an English word, pronouncing it in a kind of French manner and get away with it. Consider words like response (fr réponse, es respuesta), government (fr gouvernement, es gobierno), plateau (fr plateau, es meseta), and grammar (fr grammaire, es gramática).
  
• Depending on your situation, you can find some pretty nice government support if you want to learn French: "Immigrants who have been accepted into Quebec will now be able to take free French courses before they leave their home country. The French course seeks to familiarize immigrants with "Quebec values and culture" by focusing on employment, education, public services and life in a democracy.

  Once they arrive in Quebec, the government will ask immigrants to attend a seminar called: "How to live in Quebec." The course will be given in several languages to accommodate the 35 per cent of immigrants who don't know French when they arrive." <-- and this is just one example.

• Pronoun case usage in French is more similar to English: "Who, me?" --> "Qui, moi?" vs. "¿Quién, yo?" and "For you" --> "Pour vous" vs. "Para vos" (not vosotros).
  

But really, the two languages are just about the same in terms of difficulty so anyone considering whether to learn one or the other should really just make the choice based on personal preference alone. Which one would you like to see yourself fluent in? Think about the countries they are used in and which ones you would prefer to spend a large amount of time in. That should be the only criterion for making the choice with two languages as (relatively) easy to learn as French and Spanish.