I heard Urtext is good but different publishers have Urtext, so whats the difference?
Well, for me, the short answer is not intended as glib, but it is true: I look at them all.
Or as many as I can find or find samples of online.
So, let's say you have two copies of, I don't know, the Bach 2- and 3-part Inventions: the Wiener Urtext and the G. Henle Urtext.
I'm fairly confident that editorial choices and annotations can be researched, so if I'm buying one hard copy, I decide based on which is easiest for me to read. And, for Bach, for example, I like some resemblance in notation as to how I like to divide up parts between the hands: yes, I do that work separately, but I'd rather have an edition that's roughly "on my page" so to speak, even if it's not exactly to my liking.
There are other considerations, though.
For example, I wanted to finally buy a real copy of some of Scarlatti's keyboard sonatas. I took a gamble on the first volume of the Kenneth Gilbert edition published by Alphonse Leduc &cie.
For the simple reason that the entire series, although far too expensive for me to buy at once, had the sonatas ordered by the K. numbers. So, if I buy volume one, which is K. 1 -> K.52, I don't have to repeat myself, which seems how the various Henle or Alfred editions of Scarlatti seem to be ordered, namely, haphazardly.
Of course everyone has his or her favorites, but in my case they cannot be found among one or several volumes of "Selected Scarlatti Sonatas" of the type Henle and such put out.
And, no, the Gilbert edition is not difficult to make lie flat on the stand: one has to simply apply the right technique one uses normally, and not split the spine. It is, however, glued-in binding, and extremely poor, especially compared with the higher standards I've come to expect from FR publishing houses.
But there are other considerations: I recently wanted an "all-in-one" of the Ars fuga, so I went with Henle. Because I know it's legible print, sturdy, and so forth, and
especially, I already had done the work of figuring out which hand does what and all that. Just a simple edition for aiding memory.
And, also recently, I went ahead and bought one of the Dover editions of Debussy with a few things in it I didn't have in bound copies. I knew I didn't desire anything more than clear print, and a very sturdy edition for things like the Suite berg. and Pr le piano etc. It serves its purpose.
It's really a consumer choice, I think, more than anything else.
There's no one "best" edition. I like the Cortot student editions of the Chopin etudes and preludes, even though I am incapable of playing some or even many of them. His exercises amuse me, as does the prose. And I have digital copies of the French in case I'm puzzled by the translator or can't make out some of the fingerings. They serve their purpose for me.
Or, really, it depends on what use you want out of the score.
For some things I wanted recently just for cheap, bound copies, like the Bach Chrom.Fant.Fug. and the Toccatas, I just got the Alfred editions. I should have gone for the Henle of the Toccatas, since I like many of them so much, but that's more a cost-benefit analysis that is entirely on my head for having made. (Also, my first and only edition of the Partitas was of Hans Bischoff, which has its faults, I suppose, and I forgot the publisher of my edition, so I kind of trusted his advice on the Alfred editions of these ones).
/* EDIT: Oh, and "urtext" means less and less, generally, the older a piece of music is. Because no one is really sure what the urtext is, usually (note: I'm really talking about, say, pre-Beethoven composers where there are many textual confusions, but even in Beethoven or Chopin there are still some editorial choices, although it's clearer since the notation was more explicit). It's a kind of ideal of musicology, to discover the proto-text from which all others in the composer's hand was copied. In many cases, I think it's more of a marketing term than anything else. Wiener Urtext, G. Henle Urtext....some others....I wouldn't worry about the term "Ur"-text. There are still editorial decisions made in most cases. Whether there are fingerings or phrasing marks added, that's an entirely different thing. About the latter, I personally don't really care. Although I do like ther WTC2 with the Schiff fingerings: but that's just more from curiosity than anything else. I still use the Peters WTC1, just because. And I should buy a new edition of the keyboard Partitas, because this one has gone beyond falling apart and so forth. */