Pros and cons to every type of construction. With the poles in the ground, you get the added strength of the ground holding them upright. With the posts mounted on top of the concrete pads, you now have to deal with racking. The poles wanting to fall over. The best way to do this is with sheething. plywood or OSB work great for this. It's what keeps a stick built house standing. Before plywood and OSB where so affordable and easy to get, they would put diagonal bracing at all the ouside corners to lock the building together and keep it upright. This goes back hundreds of years and it's how most houses where built before the 70's. Attach the bracing to the top of the outside corner and run it down to the sill plate at a 45 degree angle. With houses, it's always notched into the studs. On barns, it can become part of the purlins.
Attaching bracing at the tops of the posts, such as Y bracing gives you a little bit of support, but nothing close to what you want. The top plates and roofing structure are your enemy, they will want to force the posts and walls to move around. The basic idea of how modern construction works is that in theory, you should be able to put every piece of wood in place and not need any fasteners. Nails and screws are just there to keep them in place. The design should be with this in mind. If you need to hang a piece of lumber, then you need metal brackets or notches or some sort of support. Bolts for loads are not allowed because they split the wood in time. Bolts are only used to secure lumber in place that is already supported.
What are you going to use for your siding? If it includes OSB or plywood, then you won't have any issues. If it's going to be metal, that works too as it locks the walls together on the purlins.
Eddie