Honestly, I've never liked speaking in terms of "more favorable" or "less favorable", particularly when describing two completely different reactions. I think you have to be a little careful when using colloquial words like "favorable" to describe the implications of scientific concepts - it is easily misleading. What does favorable mean, exactly? Based on the common meaning of "favorable" in English, a student might be inclined to think it speaks to rate. (Or, in the OP's only language, "easiness".) But it doesn't. To latch on to mjc's analogy, the deepness of the valley on the other side says nothing of how high of a mountain you have to cross to get there, and therefore how long the journey will take. The favorability, as indicated by Gibbs energy, refers to how far away from equilibrium a system is and in which direction the system will move/change under the current conditions. I've always thought "spontaneity" is a better word to use than "favorability", and I also think it's better to imagine it generally being a binary concept - either a reaction/process is spontaneous in a forward direction or it isn't under a certain set of conditions or a certain point in time, rather than it's more or less so. Considering (as an example) that the conversion of diamond to graphite is a spontaneous/favorable process that basically doesn't happen over any realistic timescale, I think teachers and textbooks do a disservice to students when they speak of Gibbs energy in terms that could be mistaken to relate to how fast the process is likely to happen.
Just some food for thought.