Portella

I really must thank everyone here for their points of view. It seems that I have given the impression of being overly concerned about my choice, to the point of staying frozen. I would only want to say that this isn't true. I keep going on with C#, but meanwhile, I want to keep getting informed in a subject that is still not clear enough. It's true that, as time passes, I'll probably approach the point Edd stated: In 3 years time, you may well know both Java and C# and you'll be one of the people saying "it doesn't really matter, your skills are largely transferrable between the two". Yet, I think it's the natural beginners anxiety, when exposed to a huge information flow from a competitive and fluid field of knowledge full of propaganda statements.
I know that completely unbiased opinions are very difficult to get. Even here, we can have the impression of C# being a little favored, but the important thing is that I was able to get some very useful information by people who seem to have enough knowledge to make a good analysis and for that I thank you.
Edd, I think that "tendencies" wasn't a good choice of word (it's more of a literal translation from portuguese); "trend", perhaps, would be better. Or, in the used context, "inclination of C# towards being cross-platform". I hope I'm expressing myself better now.