Catacombs in Paris and/or Rome

I can't comment on which are 'best' since that's very subjective, but they are different due to their different history.
The Roman catacombs where the burial places for the early Christians in the 4th century and they have some remnants and inscriptions from that period.
The Paris Catacombs where not originally tombs, but an underground quarry. it was only used to store bones after the local cemeteries where filled in the 18th century. The bones are stacked and layed out in patterns in rather macabre fashion.

If the kids are little ghouls (as so many teens are) then note that the Paris Catacombs are all about the bones and the Roman ones are just tunnels; no bones on display, although there are churches in Rome with displays of bones in little tableau. Here was our trip through the Paris Catacombs:
https://janettravels.wordpress.com/2013/01/12/catacombs-a-creepy-paris-stroll/

If you do decide to visit Paris catacombs I highly recommend buying ticket before you go which means you skip the line. The queues are usually long if you just show up ( 2+ hours ) as only so many are allowed inside at once
You can purchase from this site http://catacombes.paris.fr/en

While you’re in Paris, stop in The Crypt, with an entrance on the plaza in front of Norte Dame cathedral. it’s a relatively small excavation of foundations from early Paris, just below street level, and includes remnants of a heating system from ancient Roman Paris.

If nothing else, it’s a cool getaway for a few minutes from modern Paris and lots of fellow visitors.

Regarding the Crypt, it's closed due to the Notre Dame fire.

Another tragedy of the fire. Maybe The Crypt might open again soon?

It would help to know what your negative concerns are. Both catacombs are very different so I would not judge one as better than another. Just different. In Rome you are not allowed into the catacomb by yourself. You must be on a guide tour offered by the site. Our tour in Rome was well done.

You can't enter the crypt because this whole area of the Ile de Cite is blocked off for tourists and randos. You can walk down the left bank by the Cathedral and across the bridge and sidewalk behind the church and then on to the Ile St. Louis, but the plaza out front is entirely blocked off and to see the front you have to cross at the next bridge down. There is very little sign of the fire on the church itself except for of course the entire roof being gone and covered with a very nicely designed tarp and lots more scaffolding. Windows are protected with some sort of netting. There is on the area above the south rose window some signs of fire damage on the outside, but mostly it was contained to the roof and inside so what remains is not singed looking.

If the kids are little ghouls (as so many teens are) then note that
the Paris Catacombs are all about the bones and the Roman ones are
just tunnels; no bones on display,

This is one of the key differences. It's like comparing the Capuchin Crypt with the catacombs in Rome: they're very different animals, where bones versus no bones are concerned, and the Roman catacombs are far older. Both that crypt and the Paris catacombs were created much more recently in the historical big picture.

Previous thread you'd started regarding the Roman catacombs below. Depending on interests, the links provided highlight some of the reasons one might choose to visit the Roman "tunnels" versus the bone churches.

https://community.ricksteves.com/travel-forum/italy/catacombs-in-rome-2510f1c9-f330-4c18-a251-efad4b610924