Coming form a equipment operator's position, your trying to justify buying a apple or a orange. Both are required to do some task but not the same task. But from just reading your 2 posts, about working in backyards with narrow access that you can't back your trailer into the back yard to dump/load materials, your going to be doing a lot of "material handling" which is in my eyes the main function of a skid loader.
Those backhoe attachments, we have them and seem to lose more paint to rust than use. Granted our MTOE is road construction we are still equiped to do general engineering ops, and out of the 6 years of service I've actually used it once just because we didn't have a backhoe yet and the SEE was broke down.