I’ve tried a few (Inbox Dollars, Survey Junkie, Zap Survey) but Swagbucks seems to be my favorite. They have good payouts and low payouts so I check periodically throughout the day for good surveys and only use my time on the ones worth it.
I also find the website easier to navigate than most survey sites. I use Swagbucks for the many other things they offer so I am probably a bit biased.