Whats the advantages/disadvantages of building first floor joists into the walls, vs timber wall plates with joists hangers..... I assume hangers off a timber wall plate is simpler, but are there any downsides......
There isn't a functional difference. Both methods, done properly, will perform exactly the same. Building in; you are stuck with 75mm coursing. The joists should be infilled and the joint between infill block and the joists should be sealed. The joist ends should also be wrapped to protect the end grain. Wall plate method; you can have the floor at any height you want, but there's additional cost of plate and hangers. You also need to check if the hangers provide lateral restraint - if not you might have to strap separately.
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