If your goal is to use less chemicals treatments, it is not so much the design of the hive as it is simple universal practices that a beekeeper can employ to lesson the impact of parasites and diseases. Screened bottom boards, using Hygienic bees, good moisture control in the hive, knowing what's going in winter/spring with regards to food supply, changing out comb/foundation every couple years etc, etc. The style hive you end up using is purely a personal choice. Each design seems to has it proponents and detractors and I've heard many arguments as to why one design is superior to another. I'd take all these arguments with a grain of salt. I've seen bee colonies thriving in everything from an abandoned washing machine, to an old discarded couch, to an unused birdhouse. The bees don't seem to care about the space, as long as its dry, dark and somewhat protected. For the majority of hobbyist and professional alike, the Langstroth design seems to be the hive of choice. Low cost, availability and lots of ready information are the main reasons I suspect. And as you pointed out, members of your local bee-club all use them so why not.
You have a good Warre hive seller next door in Michigan. Checkout "thewarrestore dot com" Lots of info and videos on his website. I bought 3 modifies Warre boxes from him. Very nice stuff but definitely more expensive than Langstroth equipment. He does pay all shipping so if you factor that in, it really isn't that much more than ordering a Lang box and paying the freight. He can supply you with Warre sized full frames that you can use like a topbar or put foundation in it. That's what I went with and will run them without foundation, only a starter strip. If I have good success then I will probably set one up with topbars only. The Warre design has had much renewed interest since the "natural topbar hive" thing has gained traction. I would not recommend any newbie starting with a topbar hive though. The Langstroth design is allot more forgiving for beginners. I had to rescue two newbies this year from the "wacky" comb syndrome and leaky Kenyan hives. I agree with some of the other posters that there is no great advantage in using the Warre design. You can use most of the same practices with a Lang hive for less money while maintaining compatibility with your other equipment. You can also practice certain Langstroth techniques with a Warre which is what I am doing. That said I will probably be switching my other 2 Lang hives to Warre as I like the smaller size and the lighter weights will be better on my back. The main thing using these smaller boxes is you have pay greater attention to swarming potential as the bees run out of room fast in a Warre. Anyway, good luck with your new hobby and choice of hive and above all, have fun!