I'm currently learning Rodrigo's Invocacion Y Danza en see that the version of Diaz en Romero are very different in some places.
What are your experiences with playing this piece?
Wich version do you prefer and why?
I think the Diaz version is overall easier to play - he simplified things that were in the original manuscript to make it more playable. However I've heard people like John Williams and others play the more difficult version very convincingly so it's a matter of preference.
The Romero version has a couple more interesting passages especially in the mysterious Invocation intro pages. My advice is find a performer whose interpretation you like the most and play the version he/she does. There is no preferred version unless you're playing it for a competition and they ask for a specific edition to be played.