Your preference in live TV will dictate which service is best for you.
For example, if you mainly use your TV for news, finding the cheapest service that offers the channels you frequent is all you need.
However if you prefer sport, which is generally scattered across many different channels, something all-encompassing with plenty of channels is more important.
Make sure that the streaming service you're looking at has your favorite channels if you subscribe.
Price is also a major factor, as live TV services cost a lot more than typical streaming services, so you'll need to make sure you're not paying loads for channels you're not using.