Yeah, there is no one best. Some of the designs really suit the lines of the ship, others don't work as well. For some reason, some of the ships seem to look better with the solids than with the fancies.
Personally, I like to put the paints that are unique to a ship on the ship so it looks different. Used to be more of those then everything got the Asp's Apollo set. 
Here's some I like
Actually I think the best ones are the ones I submitted for the paintjob contest but didn't win 

Here's some I like
