Problem is that to an airline or any operator, often your experience that would make you a more rounded pilot or perhaps a better fundamental pilot (not saying that training on either leads to this) is often not the important thing. It's how quickly you will adapt to or how well you already know the systems and type that THEY are USING. Its all very well being able to fly to absolute perfection using only a wet compass, but how well are you going to fly a Caravan with a G1000 system in it, or a 737NG etc.