Goodnites are considered diapers.
Goodnites and Pull Ups are basically just less absorbent diapers that pull up and down easily to make it seem like underwear.
However pull ups and Goodnites are still diapers but just without the Tabs.
The difference between Goodnites and Pull Ups is that Goodnites are a larger size pull up made for older kids above potty training age.
Goodnites are meant for those older kids who wet the bed or have small wetting accidents.
Pull Ups are similar to Goodnites but they run smaller than Goodnites and are meant for kids under 5 years old who are potty training.
For bed wetting I found that my kids leaked through Goodnites as Goodnites are not that good fitting or meant to hold heavy wettings
So I would recommend regular diapers.
If your bed wetting kid is small enough then they can sometimes fit into a size 6 or size 7 toddler diaper such as Pampers Cruisers size 7, Pampers Baby Dry size 6, Luvs size 6 diapers or even a Dollar General Gentle Steps size 7 diaper.
The actual tape on diapers fit better and are more absorbent for kids who wet the bed and Pull Ups and Goodnites are still a diaper but a less absorbent pull on style diaper.