Not having to deal with Alnitak is definitely a sure sign of an awesome telescope..
In my very limited experience with imaging the horsehead.. I've found that Ha data does more for the outer nebulosity, and the darker dusty areas below and surrounding IC434, and the tonal differences in B33 itself, however IC434 seems to respond well to a no filter (by no filter, Im referring to the UV/IR filter on my QHY8)..
I dont know if thats the normal experience or something unusual in my system... But yeah, Ha definitely strengthens the dark dusty areas, where as just UV/IR filtering and RGB imaging brings out the most detail in IC434..