PS Cloud gaming is available in like twice the amount of countries, so I assume they have servers in way more countries than 15.
PS cloud gaming (PS+ Premium) is available in 30 countries:
Austria, Belgium, Bulgaria, Canada, Croatia, Czech Republic, Denmark, Finland, France, Germany, Greece, Hungary, Ireland, Italy, Japan, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of Cyprus, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, United Kingdom, and United States
Xcloud is available in 28 countries:
Argentina, Australia, Austria, Belgium, Brazil, Canada, Czechia, Denmark, Finland, France, Germany, Hungary, Ireland, Italy, Japan, Korea, Mexico, Netherlands, New Zealand, Norway, Poland, Portugal, Slovakia, Spain, Sweden, Switzerland, United Kingdom, and United States
PS cloud gaming (PS+ Premium) is already available on PC. We know it's also coming to mobile, but still don't know when.
PS is the one who started the game subs and cloud gaming in console, not MS. MS was the one following the steps of the market leader Sony, not the opposite.
The "major" new things that MS added and Sony copied were achievents and game agnostic voice chat.