I play in Franchise 98% of the time. I enjoy the trading, breeding, and care of the animals. I take part in many of the community challenges as well.
I also play it as a true franchise, meaning that I transfer animals between my franchise zoos, and manage their genetic diversity over generations. So it's not merely that I have a single zoo that happens to use franchise mode rules, but more like I am being a tycoon or running a collection of zoos (like the AZA, EAZA, ZAA, etc.), and my animals are part of a regional collection plan for me to manage long-term. Whenever we get new animals from a dlc -- or even a new color variation like albino, melanistic, erythristic, etc.,-- I kind of treat it as if the regional organization has adopted a new SSP (Species Survival Plan), EEP (EAZA Ex-situ Program) or SMP (Species Management Program).
I tried sandbox briefly, but got bored of it pretty quickly. All of the things that other people wanted to turn off in the name of creative freedom, I wanted to leave on because I'd come to think of them as creative challenges! And because the franchise market and community challenges are always turned off and unavailable in sandbox, I found that the entire side of the game that involves animal management, stats, genealogies, and breeding of animals lost their importance to me in sandbox, because no matter how well I took care of them, they were stuck at the absurdly under-priced base prices that we start with as beginners. So basically, all of the things that sandbox players say they hate when they try franchise after living in a sandbox world for a long time, I find that I miss when I visit sandbox world.
I find this quite interesting to be honest, mostly because the reason why i play franchise over the other modes is that i find neither challange or meaningfull management decisions in it.
I often talked about different things i highly dislike about it, most notably cs and the tradecenter, because i even find challange mode quite easy, but not in a good way.
Its easy to build a functioning zoo, but its hard to actually enjoy the experience, as intricate builds tend to be punished, meanwhile literally just putting down a large fence with enritchment food and a copypaste shelter is the optimal amd mind nummingly easy way to play.
Space isnt an issue, money is only an issue if you overinvest into your builds, animals also arnt if you are open to have any animals.
And if something goes wrong, just use the trade center to fix everything without any upkeep cost.
So we got a game mode that punishes detailed building, heavily favors low effort habitats and favors cheese even stronger.
For franchise the same deal, just that time also isnt an issue.
You can literally place a foodcourt, some exhibits and something that breeds alot and doesnt kill each other in a large habitat and go afk.
Comeback 3 hours later and you got a bunch of cp and money literally without effort to be able to start building.
Both game modes in my opinion fail to actually incentivise the player to build a beautiful and well thought out zoo and rather favor cheese and minimal effort, making going afk the literal best strategie when starting of a new franchise.
Ofcourse you still can build a beautiful well thought out zoo, but i can do that in sandbox without being punished for it and being able to deactivate all if the janky ass annoying mechanics that add nothing but tedium to the game.
I wish this game had a better management side to it, but rn all i see are bare bones systems asking for being cheesed while punishing the player for doing whats actually good and fun in the game, which is the building system.
Its just so weird how one side of the game is fantastic and the other just so terribly lacking