Remathilis
Legend

The TL; DR...
"To summarize, in most ways MM 2024 monsters appear to be built to the same targets as MM 2014 monsters were with a few exceptions. Their average saving throw bonus now scales slightly slower, and legendary monsters are now built to have around 40% higher DPR and 15% higher HP than their normal counterparts."
There is a lot of math, but people like @dave2008 might be interested.