@sasuke0447: In terms of content there is very little difference, so it really comes down to personal preference. I'd recommend trying both to see which you prefer.
I will say that I think Fairy Tail has a fantastic soundtrack and gives the show a great atmosphere, so if you're the kind of person who appreciates that then you might enjoy the anime more.
Vegeta is more of a rival than a nemesis.
My first thought was Frieza, but there's definitely a strong case to be made for Dr. Gero. Gero held a death-grudge against Goku ever since he took down the Red Ribbon Army as a kid, and worked tirelessly creating androids for the sole purpose of killing Goku for, what? Twenty? Thirty years? That's some grudge.
Yeah, I think I'd have to go with Gero.
Plus, isn't ecchi mean really risque clothing but no nipples are shown?
...no. I don't know where you got that idea from.
Ecchi is a genre, is basically means erotic fantasy. An anime is considered "Ecchi" when it has sexual themes or undertones, here's a list of Ecchi anime. Ecchi shows range from things like Astarotte's Toy to Queen's Blade and Kiss x Sis. Look it up on Wikipedia if you like.
It's anime between innocent anime and full-on hentai. Smut on the other hand is just another word for porn, generally used in a more negative way than the word porn or pornography.