Favorite bit is a Myler french link loose ring snaffle. No hooks, roller thingies, just an incredibly flexible, kind bit with a curved mouthpiece that is not thick.
Also, a D ring with same mouth.
Have found these to provide a wonderful soft and subtle connecting with my horses over the years. Both very sensitive and responsive, one a reformed TB rooter, the other an Appy/Belgian drafty chestnut mare…very opinionated!
Also ok with Sprenger 14mm loose ring.
Hate thick bits!