While I really liked the concept of the Delve format when it was introduced, its implementation has been lacking. It seems too rigid for many uses, and very strongly gives the impression that the monsters are just waiting around in their assigned starting squares for the PCs to arrive.
IMO, therefore, the older format is preferable. However, I wouldn't go back as far as RttToEE for my template - some incremental improvements have been made since then, notably in the layout of stat blocks. Some of the later (print) Dungeon adventures, or even better the Pathfinder adventures, would give a better example of this format at work.
And despite that being said, I'm not convinced that this represents the optimal method for presenting adventures. I think there is scope for experimentation in this area, as there may be a third way. It's just the best I think I've seen to date.