SP is better, you can do anything you wish to without being annoyed. You can drive either a trycycle, a snowplow or even sick looking lowered Brazilian truck, nobody will stop you.
Also you can yell when AI cuts you.
SP is the best, with no limits (I like to go a bit more fast than mp limits) + IA makes the cities and rba and all realistic
MP its great if you have some friends and what to ram them for cause ℅100 of damage .
I highly recomend to hack the mp, or you will get poor on first 500m you drove, cause lot of crashes..
It happened yesterday morning, and yes what i said about it being two weeks is complete Llama shit, It was just a Promods Beta Tester having a laugh.....