I'm not really a huge fan of straps just because I don't like the way they feel, and if you're really doing heavyyy squats or a ton of squating and you have knee problems, it make sense to support the whole joint/muscle system IMO. I know a lot of people who have great results using flossing straps to wrap their knees, but really it's kind of time consuming, requires a good knowledge of the workings of your knee, and you can't do much else once you have it on - however it is by far the most supportive thing you can do for the knee.
PERSONALLY I have started using
Rehband Knee Sleeves. They offer just the right amount of support, and the best thing abou them is you can do everything else in them that might come into play (running, jumping, etc). While I'm pretty new to them, I have loved them so far and they are very popular within the fitness community I am involved in. Even with a previous patellar tendon injury, these offer plenty of support for me.