Aw, sorry to hear about your beardie

That had to be hard to lose such a long-time friend.
Jacksons need a lot of water and higher humidity compared to veiled and panther chameleons, plus they like a little bit cooler temperatures. The water becomes an issue if you don't have a drainage system set up or if you don't have an automated mister to run if you are gone for long days. I go through about 2 gallons a day between the automated misting system and the dripper, which means I have to have a drainage system that can drain away about 1 gallon a day. My two biggest issues are maintaining humidity levels during the dry Midwest winters (30% in the house, ugh!) and working out his nutritional needs.
Jacksons are montane (mountainous) species and require less supplementation than is recommended for veiled and panther chameleons. It's easier to accidentally overdose them on certain vitamins like A and D3.
My most recent challenge was figuring out why he stopped using his tongue properly. I thought I was doing everything correctly, but when I switched up my gutloading and supplementation a bit, the problem corrected itself, so it must have been nutrition-related. I give him crickets, superworms, silkworms, hornworms, blue bottle flies, snails, and isopods. Jacksons generally don't eat any vegetation, but Veileds will.
I'm not sure of the dollar investment to set up a bearded dragon, but it can be pretty pricey to get everything you need for a chameleon. I'm sure I dropped over $600 getting everything, and those were just the "needs" not the "wants". But, I was starting from scratch, which you may not be.
There are some excellent caresheets and other information on this forum:
https://www.chameleonforums.com/care/caresheets/
Finding a vet who is knowledgeable about chameleons might be difficult, too. Beardies are much more common - even my exotics vet only has a small handful of cham patients.
Bottom line, my Jacksons is needy but not difficult. That is probably true for all chams, but maybe Jacksons are a little less forgiving than Veileds. He has the cutest personality - you can just see the little gears grinding in his head when he's about the get into trouble

I let him out all the time, but he'll never be the type to hang out on my shoulder.
Regardless of what cham you get, this is the best place to get info and help. It's been really great being part of the community here.