I think she shot him first for the following reasons:
1. Because she brought a gun with her intending to use it.
2. Her interrogation statements indicate, if you read between the lines, that she shot him and the gun jammed, (and I think she started stabbing him as a result).
3. IIRC, I don't think the ME stated it would be impossible for Travis to survive for a little while after a gun shot to the head.
4. We have seen people survive gun shots to the head, like Gabby Giffords.
Re: I did not mean to imply I believed it would have killed him, but incapacitate him, render him unconscious, yes.
5. We have a poster on here very familiar with guns and with 25s who stated that a 25 would not easily or instantly kill a man like Travis.
6. I think jodi would have believed that a gun shot would immediately incapacitate him while stabbing is more iffy and she would not have wanted to get so close to him such that he might be able to disarm her, which a knife would require.
7. Travis was sitting down in the shower right before the killing began and the trajectory of the bullet shows he was shot from above from right to left which mirrors how he was sitting right before he was killed.
8. Her stories about the intruders probably mirror to some degree what actually happened.
9. Travis was found with the head wound facing away, and towards the wall of the shower. We know that he left the shower during the killing and was dragged back into it and we know he was shot in the shower. It makes no sense that she would shoot him and then pull him back out and turn him around so that the head wound faced away from her. Too much work.
I suppose it doesn't matter much except stabbing first may indicate a bit more ruthlessness on her part. But either way, this is one of the most vicious murders I have ever seen.