If you would describe your horse as the following:
Gustav is constructed with a 100% super smooth surface, even around the joints which are designed to never interfere with or push against the palate. It is a very comfortable bit that shapes naturally around the tongue and relieves the bars from constant pressure.
Gustav is an ideal design for sensitive mouthed horses whose mouths easily develop cuts, sores or rubs.
This sidepiece is designed to keep the mouthpiece steady and give a framed feeling.
Baucher is to prefer if you have problems with wounds in the corners of the mouth or wears on the premolars (P2). The Baucher will reveal these places from constant pressure and help the horse to relax.