I wouldn't be too hasty to single out the Ju 88 as being inefficient compared with the Mossie as a recon aircraft; the effectiveness of German recon aircraft shouldn't really be in question as British recon losses over enemy territory was also high - although the Mossie was a better performer than the Ju 88, nevertheless, the issue was that British air defences improved to an extent that German aircraft could not operate satisfactorily over Britain. The key reasons for the downfall of German out of theatre strategic recon - and yes, they had their specialised unit like the PRU, before Sidney Cotton came along and it was formed as a branch of the Abwehr and it produced extraordinarily complete images of future enemy countries' defences during peacetime and also during wartime over North Africa, Italy and crucially over Russia produced very good coverage of these countries - was numerous.
One aspect that causes us to disregard German PR is the scant attention it gets in the press. Very few dedicated books have been produced on the Aufklarungsgruppen by comparison to British recon in particular, especially the PRUs and Mr Cotton, but , like I said, the German photo recon was of no less importance to them, was well equipped and technically very efficient and equally as capable as that of the Allies during the war.