Cobb AP *version 2* is better. It can make any changes that open source can do, but it can also do real-time tuning and store multiple maps for things like valet, high/low elevation, race gas, etc. Its main (perhaps only) disadvantage is price.
Open Source is cheaper, but you cannot do live tuning (yet), and you cannot (yet) store multiple maps for quick change-over. On a budget with a simple stage 1 or 2 or 2+ setup it is the way to go.
Either method is only as good as the "map" loaded into it, and they are essentially exactly the same once it is loaded into the ECU.
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