The land use trade-off is not between urban and agricultural, it's between farms and forests.

Taken from Eurostat.

Click to enlarge:



UPDATE: Further to Kj's comment, I have done another chart to show the amount of developed land relative to the adjusted value* of agricultural land.

Click to enlarge:



* I applied relative values of 1 to arable land, 1/3 to grassland i.e. pastoral land and 1/20 to woodland. I excluded water areas, wetland, scrubland and bare land.

** The list excludes Malta, Cyprus, Bulgaria and Romania.