The differences between Pampers Baby Dry size 6, Pampers Cruisers size 7 and Pampers Swaddlers diapers are in the sizes and the softness and the way the diaper fits.
Pampers Baby Dry size 6 diapers or other sizes of Pampers Baby Dry diaper are meant for babies and toddlers to wear either all the time or when asleep and they hold up good just like the pampers cruisers diapers.
However Pampers Cruisers are made so they stay put around the toddlers bottom and waist while they are more active.
So if your toddler is around 2 or 3 years old or so and they are pretty active such as running around, climbing, wrestling with their siblings etc then Pampers Cruisers would be a better diaper than Pampers Baby Dry diapers.
Pampers Swaddlers are made more comfortable for newborns and non active babies.
However even active toddlers and babies can wear the Pampers Swaddlers and they do come in a size 7.
The Pampers Swaddlers are made more blanket soft while the Pampers Baby Dry diapers and Pampers Cruisers are not although they still are soft and comfortable diapers.