I only took 1 year of high school Spanish (though in middle school we had Spanish classes too) ...
I am not fluent, but can read Spanish decently enough. It can be useful from time to time. It was very useful back when I worked at a help desk job about 15 years ago. We have stores in Puerto Rico, and knowing a little bit of conversational Spanish really made those calls MUCH smoother. We had a couple of fluent Spanish speakers on the team, but, I knew enough to get by. It was really useful especially overnight when there would almost never be an on site fluent Spanish speaker on our team.
Anyhow, Learning some latin would be useful for some jobs (biology or medicine maybe?), but, learning Spanish as some real life practical value that you can use day to day. I would recommend Spanish as likely being more useful, however, if you learn one, the other will be easy enough to follow since they are quite similar.