It depends on how many people will be on it and what you intend to do with it. They both sound good but with past experience I would say the more RAM the better, you will find if you make your server public you will probably need more than 2 - 3 Gb of RAM depending on how well you maintain it and how many/what plugins you have!
Saying that my old, old server lasted with 1Gb of RAM for about 3 weeks with about 10 daily visitors, in this situation try and ask yourself which one will be better in terms of support etc... Seriously if you get one that takes 48 hours to reply to your ticket when the server isn't working, it's annoying.