If you’re willing to spend a bit more for a good quality trade, that at the same time is super readable and kid friendly, I’d look at the X-Men line of Marvels Epic Collections.
Just looking on Amazon to see the ones that are currently in print, you have some amazing storylines. I see Second Genesis, Dark Phoenix, The Brood saga, and for 90’s fare there’s Legacies, and then Fatal Attractions coming in April.
I will say some of that 90’s material might be more teen oriented, while the late 70’s/early 80’s stuff is mostly lighter fare.
But regardless, definitely take them to a comic book store and let them rummage through the bins; I have some amazing memories of doing that around that age.