I'm not big on slings but of the two you have, I'll vote for the blue one. I used a sling like the brown one but stopped after few months. The reason was b/c the shoulder the sling was on starting hurting. I don't know how often you'd be using the bag but if it's like me, I'd like to recommend you get a backpack type that supports both shoulders.
I know these little guys won't weigh much but for me to add extra 5-6 lbs on just one shoulder for 40-50 min every day, the stress of the weight was piling up. It also puts stress on your back as well. So if you're planning on using it regularly like I did, I'd really like to suggest you get the backpack type. If not, I still vote for the 2nd one b/c it just seems more comfy for the pup.
