While I'd concur that most Michigan trails aren't especially technical, unless I'm missing some steeper, rooty climbs and descents on green valley, then I'd have to disagree with that comparison.
Holdridge is a pretty good mix of flavors. The shorter west loop is pretty flowy, with little bits of tech. The bigger east loop is more challenging, with more climbing and more elusive flow.
Brighton would be a good choice, with good mileage and variety. Poto is well liked and has good flow mixed with a few steep, rooty climbs. If you like flow trails, the new DTE trail is a very popular choice, but starting to get a bit far from your location. More local to you would be Lake Orion High School trails, and maybe Bald mountain and Addison Oaks. They're all worth riding, but we generally lack true destination trails in lower Michigan.