Same comments as above.
The Pro Sticks are dedicated ADS-B receivers (by nature of the filter).
The 'V3 is a broad band receiver (25~1700MHz), but with less gain and no filtering.
When mated to the matching filter/amp, most reports show the V3 combo has the edge.
The V3 has a number of construction improvements (metal case, heatsinking, Bias-T) plus the ability to access the Clk line to make use of an accurate external oscillator or slave one V3 to another and a bunch of other features you won’t use receiving ADS-B.
As a versatile SDR, the V3 rocks, but at twice the price (for the combo), it’s your call if you think the benefits suit you.