It is weird - my experience with deltas has compeltely moved me over to the delta camp.
That said - I never bothered to try and tackle topographical 'levelling'.

Deltas are faster, quieter, considerably less inclined to prints detaching part way through. Print quality is at least as good as cartesians.
Plus they look a lot cooler :-)
Also much easier to build and mechanically troubleshoot.

But you do need a build plate you can level mechanically.
That whole non-auto levelling doesn't look like fun.