I tested Darwin's theory in kayaks. Man, I love those little boats in a class four rapid. Then, I bought an old town when the wife and kids got tired of sitting on the bank, lol.
What is it you're shooting for? A woman's handbag, a Black powder possibles bag, or some other usage? It's hard for me to comment on just an assumption.
Not only the proper type of glue but the correct application of the glue is also critical to a good bond. Glueing and sewing in leather work is the same concept as gluing and nailing in woodwork; they work together to make a better and longer-lasting product.
I just had to repair a dog leash I made four years ago. It has been used hard on a daily basis. The Weldwood I used on it was still flexible and strong enough that the leather tore before the glue gave way. Glue is only as strong as the leather is, no matter the price you pay for it.