Main difference being that erlemeyers can't handle vacuum.
Vaccuum erlemeyers are not suitable for heating and as such we use round bottom flasks.
RBF's with multiple necks are useful for all sorts of reactions something which is more difficult with erlemeyers.
One of the downsides is the use of a heating mantle, it will have to fit the flask and one would need a different one for all sizes which is
expensive, since I own only one I often use erlemeyers for the simple reason of having more contact surface with the heatsource.
I also tend to use the cheapest glass since accidents happen, I'd rather break something cheaper when I can get away with it, wear should be
considered too especially when materials are know to attack glass.
Stirbars are a consideration too, heating mantles with stirring function are quite expensive which makes a hotplate + erlemeyer the logical next best
thing.
There is no one size fits all answer here but in my case too erlemeyers are the workhorses and RBF's are used in more specialized situations.
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