riss

That's so mean! How could you be so mean  I'm just kidding lol, had me for a second thinking you did call the person a moron LOL
 

Have to agree with personal preference. I recommend just having a look at different vehicle packs and models from the past months, and even watching a video of someone showcasing that certain vehicle pack to get a better understand of the pack itself.
If not, download and play around with a few.
 
Personally, I change my vehicles every few weeks or so, to keep it interesting. Though I am from Australia, it is nice to patrol with vehicles from states around America.
It's up to you, is what I am saying. What you like.

This one seems to be a bug actually in the sense that it does happen quite often with random peds but it was not supposed to be a cop...

Heh. Judging from Twitter, YouTube comments, and GTAForums something tells me the OIV team are going to regret mentioning PS4. 
Just a sea of 'how do i get this to work on my ps4?!?!?!?' 

Works quite well actually, however criminals will use tasers instead of pistols now.