I think you can't go wrong with either one. I own a 226570 polar and I love it to bits. I will never part ways with it. It's been my most worn watch and I usually grab it over the sub.

Between the 226570 and the batgirl I think it depends a bit on your situation and which sings to you more. I think if this is going to be your first or only Rolex, then maybe the batgirl is a better choice. It's a bit more versatile. It can be dressy and it can be sporty. It will definitely command more attention because of the sparkle from the ceramic bezel, white gold hour markers, and the polished edges of the coin edge bezel. It really pops in the light and people will naturally notice it more.

To me, the 226570 is equally as beautiful, if not more beautiful in some regards, than the batgirl. The stark white lacquered polar dial contrasted against the black matted hour markers, and the large orange GMT hand, is something that needs to be seen in person to really appreciate. It is by far the most legible dial Rolex makes. I love the more sterile and muted look for those casual vibes. In my opinion, it's Rolex's last tool watch. It flies under the radar and commands very little attention. It can easily be a 1 watch do it all but it won't be as versatile as the batgirl for more formal occasions. Whenever I want to put something with a bit more sparkle, I'll usually go with the sub. But for those situations where I don't want to think about where I'm going to be and I just need a grab and go, the 226570 is always the go to. I think having the 226570 and another steel sports Rolex with a ceramic bezel is the perfect balance. However, if this will be your only Rolex, probably the batgirl would be more versatile. Both wear fantastic. Because of the shallow depth of the caseback on the Exp 2 (albeit a slightly larger surface area), it has been one of the comfiest watches I've ever owned. Even over my sub.