I'd rather they make the map using tiles. If they aren't going to give a map that you can lay out on the table, you'll have to either draw it yourself or build it out of tiles. I run a game at a store, so I don't exactly have room for a big grid to draw on, and I'd rather use the tiles I've paid for than have to print out a new map for each encounter and pay for that paper and the ink, etc. I don't mind if it uses the tile or not, but when the rooms are 'odd' sized so that you can't really make them out of tiles, it's a bit frustrating. I'm fine with using dice for random things like doors, boxes and such, although it's a bit hard to do things like hindering terrain since characters can still go in those squares. In the case of the dungeon delve it let's you actually use the terrain that appears on the tile, which is more helpful than just using the tiles to approximate the maps.
Ultimately, a drawn map can copy the tiles, but the tiles can't really copy anything that isn't made using the tiles.