England take on the Proteas in Cape Town this Friday as they begin a three-match T20 series.
And Roy believes that one of the visitors’ greatest strengths is their deep pool of players that thrive with bat in hand.
As such, England will have numerous capable openers to choose from, including Roy, Jonny Bairstow, Dawid Malan, Ben Stokes and Jos Buttler.
“It’s mad, the amount of batters is quite frightening for our top six or top seven,” Roy told reporters. “It’s a great position to be in.
“I’m not fussed who I open with, whether I open, what goes on, what dynamics they go with, but it’s a good position leading into a World Cup,” Roy said. “I don’t have a preference.”
The T20 World Cup is due to take place in India across October and November 2021.
England last week confirmed a tour of Pakistan for next October, their first in the country in 16 years.
The teams will play two T20 fixtures as preparation for the World Cup.