Pointing out a slowly learned lesson from my experience, I would not worry as much about which bags to get, until I would go over in my mind, in a very detailed way, about how I'm likely to travel.
There is the image of me - in Nepal, or the SouthWest of the USA, and there is the reality of where I normally trundle along. Epic, heroic fiction played the major part in choice of bicycle as well as the gear. A bit of reality mixed equal measure with experience resulted in a lot of re-buying.
![Smiley :)](https://thorncyclesforum.co.uk/Smileys/default/smiley.gif)
Plus there is the personality quirk inside of me, that I tend to like the extremes rather than the sensible middle. In every adventure, from photography, to canoeing, to cycling, I start out by daydreaming about the one. The one bicycle, for example, that can do it all. The one panniers system that I can do everything with and out of. The perfect tent. And then slowly I get grumpy about all the compromises and slowly I spend every nickel to change the gear to get narrow purpose gear. And I seem to never learn my lesson.
I started out with the awful Fuji touring bike. That was named "squidward" because at 18KG it was as firm and steely as a squid moving forward. That bike was going to kill me. So I went to extremes and got the Hulk bike - the Nomad.
It was the same with Panniers. So many details to learn about that I never anticipated from the manufacturers spec sheets. I think everyone starts out with wanting the "best" kit, but if the op is anything remotely like many of us - brace yourself - you will need to play the field a bit (or a lot). So in that sense, it hardly matters what you choose. Flip a coin and choose one - it will just be the first of many. Oh, and it's important to get the significant other on that same page.