Old LEGO is way better. I consider old to be up to 2013, and new from 2013 and up. The old sets just feel better. Nowdays almost all themes are licensed (that is a controversial topic, I am not going to get into that), but for example compare the Fantasy Era Castle sets with the 2013 ones:
2007 King's Castle
2013 King's Castle
2008 Agent's HQ
2015 Ultra Agent's HQ
I don't know about you, but to me the older versions of those sets feel way better. They are still great, and I would gladly buy them, but the older ones seem way superior. The new sets are still good, but in my opinion, the older ones are better. This is why I am done buying the new sets that come out, and I only get old sets. Until I have more of those original LEGO Themes back, I won't buy any more of the new sets they produce, since I just don't really like them, and why waste my money I don't really want?