When you're offering to large old-ish enterprises like banks and such you will likely want to go with SOAP.
When you have a lot of high-speed data, you will want to go with sockets and a live stream of small bits of data. Like Twitter's firehose for instance, or getting Wall Street data for your bot trader.
When you have a lot of high-speed data, you will want to go with sockets and a live stream of small bits of data. Like Twitter's firehose for instance, or getting Wall Street data for your bot trader.