"Good players have missed out because the competition for spots in our world class side is now more intense than ever. We have improved depth, so we have hard choices to make -- and that is exactly the situation we want," she said.
ICC women's player of 2016 Suzie Bates will captain both sides and promising 16 -year-old legspinner Amelia Kerr, who made her debut against Pakistan, will play only in the one-dayers.
Tiffen said the team would be boosted by those who have played in the WBBL.
"It has provided a litmus test for a number of our players against Australia's top cricketers," she said as the side builds towards this year's World Cup.
T20 squad: Suzie Bates (captain), Erin Bermingham, Sophie Devine, Maddy Green, Holly Huddleston, Leigh Kasperek, Katey Martin, Thamsyn Newton, Katie Perkins, Liz Perry, Rachel Priest, Amy Satterthwaite, Lea Tahuhu.
ODI squad: Suzie Bates (captain), Erin Bermingham, Sophie Devine, Maddy Green, Holly Huddleston, Leigh Kasperek, Amelia Kerr, Katey Martin, Thamsyn Newton, Katie Perkins, Liz Perry, Rachel Priest, Amy Satterthwaite, Lea Tahuhu.
-AAP