I still find CNBs faster. The mission targets can be sort of fun but it takes time to get to each and they're a bit hit and miss.They've patched it. Now you don't have to go randomly find pirates - once you warp into the system you'll have a target marker and the pirates will be traveling in a big group. As long as you don't have valuable cargo they won't attack you and you can kill them one by one. There's typically 7 per group.
At CNBs I just have lots of fun and the way they can kick off in big battles is great.