RE: Another debateable question
I don't know a whole heck of a lot about the pistol aspect of shooting, but I have heard many say it is tough. I say if it is more of a challenge to you than your bow, the trophy should be just as respectable. It's all about YOUR sense of pride and what YOU have worked for personally.
I don't think anyone on here can tell you that it would be less of a trophy considering the skill that is involved (but I am sure some will try...).
I would worry more about your consistency and the chance you may miss the "sweet spot". If you are more accurate with your bow and you know Mr.Monster was waiting on you to harvest him, I'd probably take the bow. HOWEVER, if you want to have a pistol trophy on your wall, go for it if you know you can kill it.