Unfortunately its still really a question of getting a sound that is OK and not horrible. None of them produce a really good natural sound. I have settled on a hIghlander under saddle + omni mic blender rig. Its ok
Best sound I heard in recent years is Chris Wood using a mini OMNI DPA mic clipped near the bridge of hos Oddy guitar - I can't afford another £400 experiement though!
PS The DPA's are the same as the little mics sports presenters sometimes have taped to their faces