In one universe Jack and Ianto met in Starbucks, where Ianto worked.
In a different universe Andy Davidson joined Torchwood.
In another universe Owen got married to Katie, and they lived a long fulfilling life together.
Toshiko failed A-Level Maths in one. While Jack never let go of Gray's hand in another.
In another Gwen was the genius of Torchwood, and it was Tosh who had the life.
In one, Owen had a loving Mother while Jack and Ianto, got married and had 8 kids, all named Toshiko (Even the boys.)
And in one;
They All Lived Happily Ever After.