I think it really depends on your need, what e-currencies you will use more. I cannot say that AlertPay is better than LibertyReserve or otherwise, because they have their own advantages and disadvantages. And I also think that there is no harm in making accounts in more than one payment processors. I think it will make you have higher chance to earn online, because then, you will have more choices.

Btw, I heard E-Gold is finished. I do not know about this, because I do not have any E-Gold account, but I see that there are still many sites using E-Gold. But I also heard that the conversion rate is way low.