Since it came out. My favorite is still the pt with grey. I think it has everything going for it. Size, a good modern design, functionality, and automatic for daily wear. IMO its only problem is, that it feels too top heavy on the wrist for my taste. Ive tried it on many times and somehow , it feels off balance to me.
The 5170 really surprised me a lot. When I saw the pictures, I thought it was too boring. Too straight a case design and I didnt like the fond on the dial. Then I saw it in a window last weekend, and I thought, yes, boring! But my interest was caught and I went in to try it on. WOW, it changed it for me. On the wrist it works extremely well and I would takenthis watch over the 5070 any day ( okay, not the 5070 P ;-) ) a much more balanced design and it sits extremely well and balanced on the wrist. What I also liked a lot was, that the watch i quite descreet. When you see it on the wrist, from a few meters, you dont notice the chrono registres so much, so it doesnt scream " flashy cronograph"! It is top chronograph that is also a bit stealthy. That really charmed me, a lot. On the wrist, its a super watch.
I wish I had your problem;-) to me its certainly no longer an easy choice!
Christian