According to Wikipedia, "Each version has been released in different editions, which add features and price to the most basic release." So it's more about which edition than which version.
Obviously, the more fully-featured and the more expensive, the better tool it will be. But if your budget is tight then you need to compare what you want to code for and how easy you want to make life for yourself with the feature set of each edition. The Delphi web site should tell you about the editions. Only you can know what you want to do and how you want to go about it.
"Klinger, do you know how many zoots were killed to make that one suit?" — BJ Hunnicutt, 4077 M*A*S*H