A lot of the time knee pain can actually be something else, the two key ones where the pain comes from the knee is hamstrings or ITB as both being tight can pull on the knees.
I don't think anyone would believe how many pairs of trainers I have tried over the years and what makes it worse is sometime companies totally change the shoe, so for example I wore Mizuno Wave Rider for about 3 years and then they changed the shoe and I couldn't wear them anymore. Most of my running is in Adidas Solarboost currently as due to my injuries I'm just doing short easy runs but they are great for long easy runs too. I used a pair of Inov-8 X-Talon 200 for my XC half marathon at the weekend but because I haven't done much of this sort of running for a while they have left my legs in tatters as they are an aggressive XC shoe used for short XC races in the winter (very grippy for all kinds of terrain when you cant wear spikes). Previously I did all my faster workouts in (a number of) pairs of New Balance 1400s, even ran a few marathons in them (including my PB) and they are fast and aggressive but the sort of shoe you bring in slowly as batter the calves. More recently (when I can actually run semi okay) I have been using a pair of nike Fly knits (and have a pair of zoom fly 3 that I got in the sale too) which truly are comfortable fast shoes for harder workouts. I do have a pair of vaporfly as well which I got last year and are basically cheating, I ran a 35:45 10K while injured and a bit unfit in them which is like my 3rd or 4th fastest 10K time.