I Think it's a matter of personal preference and needs; the Pandora seems to be much more roomy than the Bal. Then again, the Bal is more slim and sits closer to the body.
Pandora. I bought one last week in Pepe leather and I adore it. It’s roomy yet relaxed and hangs well. I have many crossbodies and this is by far my favorite bag.
I love the look of the hip, even bought one but had to return because it doesn’t fit as much as you would think. Pandora looks much roomier, so not sure these bags are in the same category.
If you are worried about size, the Pandora is definitely bigger. The Bal Hip bag is just a bigger then the LV Pochette Accessoires (as a reference). The Pandora fits more then the Hip Bag. I personally have the Bal Hip bag as I don't carry much stuff and it is plenty big enough for my needs. I do not own the Pandora as I personally don't care for the look of the bag. They are both casual styles that pretty much serve the same purpose. I would suggest not buying both. I think you would likely gravitate towards using the one you like best. My recommendation is to try both on and buy the one that fits your lifestyle the best.