Well my first album was RA - Earthcall and then Artha - Dream Telepathy, before that I labelled the album Loud - 5 Billion Stars as Goa. I didn't listen to any old school until about 2-3 years into my experience and didn't like it until one special night with me and Hallucinogen. How about that for credentials?
There are pretty big differences between the two. But I think we already know what they are. Old school had a sense of play about where you can almost feel the artists on the other side of the track. The good albums certainly feel like they come from artists with a broader musical range who loop A LOT LESS, probably due to hardware. The tracks have quirks and more subtle changes that are a result of live knob twisting and all that. The looping that does go on gets tweaked so it doesn't sound so same same. Also the tracks have room to move, much more space in oldschool.
HOWEVER, Kick drums are often weak and even if a good melody is present, having starting from heavily layered music I miss the craziness and extra psychedelia present in Neogoa layers. Some Old school blows my mind and I love how nothing is placed in a track without a purpose, but the real eargasms, increased heart rates and jumping around comes from Neogoa.
While I hear the creative genius behind the classic old school albums, I get far more lost within modern classics.