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The Labelled Block Until Done essentially is a "Block Until Done" tool. It takes a stream of data and doesn't allow any data to exit the tool until all incoming data has been read. Once it reads 100% of the data, it sends all of the data through Output Anchor #1. When all of the data is sent through that anchor, it sends the same data through Output Anchor #2.
The Parallel Block Until Done is a different beast. It can control two (2) streams of data. It will similarly read all of Input Anchor #1 and then output the data but will not begin the output of Anchor #2 until all of the output from Anchor #1 has been passed through the macro.
If you are writing data to two (2) different sheets in an Excel file and want to try to avoid a write error, you might want to use this macro. I'd use the 1st anchor for the "smaller" set of data. Within Alteryx this is one of the few ways to cause certain processes to run before others.
Alteryx ACE & Top Community Contributor
Chaos reigns within. Repent, reflect and reboot. Order shall return.