Is Ibanez RG4 better than RG3?

im gonna buy my first elecrtic and I have in mind the Ibanez RG series. Im thinking in the Ibanez RG3EX1 or RG4EX1 but I dont know which? I have seen people say the RG4 is more expensive and have a lot of problems with the tremolo or something like that. Is it truth? Should I better buy the RG3(less expensive and no tremolo probs)? What Should I buy? I like all kind of rock to hard rock, all kinds of metal to heavy metal.