spanish or frenchWatch
Subject wise: Spanish easier to learn because its grammar is simpler and it's spelling, pronunciation and verb conjugations are easier too.
Language-wise: meh. Spanish is more widely spoken, but they both quite common languages. They are both romance languages and have some similarities due to this.
I am fluent in French as it's my first language anyway, so I might be a bit biased, but I did Spanish in school and I can guarantee Spanish is easier. Advanced levels of French are a damnright pain in the ass especially with old verb tenses, and French has many more inconsistencies due to its linguistic history (which is definitely more interesting than Spanish's IMO).
But whatever. They're both great. Whether one is better than the other is entirely subjective