All of the streaming services give you a free trial (usually a week) I recommend trying several services to see which one you like best. When I did it I made a list of shows / networks I wanted and compared which packages had which shows, then tested maybe 6 different services. I used DirectvNow for a few months, but it started having issues, so I then switched to Hulu, and I've been pleased with Hulu live TV for many months now.
Also for some shows you can watch directly from their website (The walking dead for example - AMC is not on my streaming service, but I use my tablet and watch it on AMC.com)