I woud opt for the Pro 20# capacity. It is less prone to leaking, The IV 10# is a great little melter but is prone to dripping and has been named by many lil drippy. I have both and use both, Cannot complain about either model.
The 20# model takes a bit longer to heat up and IMO with the guide system is easier to use. The smaller footprint of the 10# makes it nice on the pouring bench


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