The Spanish Empire has also included the Portuguese one when both countries were unified under Philip II. This extended its range to the mini-colonies along African and Indian coast (Equatorial Guinea, Sao Tome, Angola, Mozambique, Goa, Daman, Diu, Ceylan...) as well as Malacca in Malaysia, the Celbes and Molucca in Indonesia, Macao in China, a part of Nagazaki in Japan and obviously Brazil. This made a much wider empire than "just" the South American Spanish colonies. But later these empire grew up distinct again.
South America is now dominantly Native Spanish/Portuguese speaking and is culturally so as well (so countries somewhat less, like Peru and Bolivia). The religion is uniform and the people feel like a large community of Latin American (with Argentina the exception, feeling more European, but still).
In comparison, the British Empire was overwhelmingly commercial, especially after the independance of the US. Canada, Australia and NZ were the only real colonies of British settlement. African and Asian colonies were never more than administered by the UK. It surely was more peaceful and efficient than massacring all the infidels, raping, killing and converting all the people living there before their arrival, as the Spanish did. Nowadays, English is more widely spoken than Spanish, but fewer have it as a native language. I have travelled around all India and was happy to see that uneducated poor people could understand some English, but very few speak it fluently.
Today, people see the Aztec, Mayan and Inca ruins as part of Spanish speaking countries. Some would almost say it's a part of Spanish cultural heritage !

But never would even think of the Taj Mahal or the Great Pyramids has being part of an English speaking country (not even has an Arabic heritage for the Pyramids). It shows how deep has been the Spanish deculturisation of South America to impose its own system, language and especially religion. Look at the oddity that are the Christian Philippines in Asia, in the middle of Buddhist, Hindu, Confucianist, Taoist (now more Maoist, though

), Shinto and other Animists. They are one of the most fanatical Catholic group in the world. Did you see in the news yesterday that a man even cut his penis, inspired by the Bible, because lead him to sin !!

(
http://dailynews.yahoo.com/h/nm/20011207/od/penis_dc_1.html)
But without the British there would be Hong Kong, Singapore, Australia, NZ, Canada, the USA and many others. Or at least not as we know them today. Even the future of India owns a lot to the British - Aren't 20 millions of upper class Indian Native English speaker having studied in England for most of them ? Isn't English the lingua franca of India, even more than Hindi, because the South Indian prefer English to Hindi. It is anyway the main administrative language used by the government.
I chose the British Empire because it was more civilised and had a more global influence. But the Spanish empire was impressive as well.