How to choose correctly a provider of streaming?


I´m not asking for a recomendation of a specific streaming service provider. I wonder what aspects must I consider to select the correct one.

I need a transmission provider to a television station (official website), which provides:

  • Video and audio streaming.
  • Permanent transmition.
  • From 50 to 250 concurrent users.
  • Just live events, non on-demand

The first aspect is easy: find a provider that includes these features.

The tough aspect is: how to know that one provider is a good choice? Must I search in their forums? Which technical aspects tells me he is reliable?

I think that only asking directly to each provider will give me this answers, but some help (from experienced users) in identifying crucial aspects previously will come in handy.