I have experienced plenty of "last minute" refurbs at WDW. I do not have data that says DLR or WDW handles this better or worse than the other.
DLR is much more predictable of when refurbs happen. If "every time you've planned a trip they drop refurbs...at the last minute" then I would say every time you have planned a trip you have chosen a bad time to visit. I rarely encounter refurbs at DLR as I choose to visit during times of year when refurbs rarely happen. These times of year are spoken of around here clearly and often. Have you ever asked? For example, see "Choosing When To Visit DLR: Summary of High and Low Season and When Each Happens"
www.disboards.com/showthread.php?p=36509602. It really is not that hard.
DLR is not WDW. There are things that are better at DLR and things that are better at WDW. DLR has to deal with the City of Anaheim. This has many ramifications including access to water and power where they depend on the city and the utility. WDW does not have such issues because of the land Disney owns in Florida and they have their own municipality and power plants.