I find certain cuts of so-called ‘braising steak’ better for some dishes than for others, so that in all my recipes I generally name the cut and suggest you always ask for it by name too. Unidentified stewing or braising steak can often be a mixture and can cook unevenly, I’ve found.
Below is a list of the cuts that are suitable for braising (and stewing too); as you would see from a chart these cuts are always from the same part of the animal’s anatomy but, confusingly, the way they’re cut varies from region to region.
My own favourite cut for braising, where I live in East Anglia is called chuck and blade steak. In other regions it can be called shoulder, which is exactly where it is. If you want large pieces of meat rather than cubes, thick flank is suitable: actually from the hindquarters and called round or flesh end in Scotland or bedpiece elsewhere.
Beef skirt comes from below the diaphragm of the animal. It is however an excellent cut for braising and one end can even be grilled if scored across the grain and tenderised by marinating before cooking.