My mother would like to purchase a BMW convertible and i was wondering which convertible would be more practical to fit our family, a

BMW 3 Series e46 Convertible (2001-2006)
OR
BMW 1 Series e88 Convertible (2007-2010)

Just wanted to know which one is bigger and will fit two kids/adults in the back more comfortably and has more room.

thank you all