which is better?

purpleup has always been regarded as nothing but a joke and/or gimmick in this hobby, at least by the chemistry nerds who know a thing or to about aquarium chemistry. If you don't feel that your tank needs full blown 2 part, then kalkwasser or pickling lime is an inexpensive alternative to keeping your tank at a relatively stable level, while being able to add calcium and alkalinity in a balanced set.
 
you've seen my tank. kalkwasser can deff keep up with the calcium and alk needs of a tank. that's all I do and everything is growing happily!

but on your question...I would say b-ionic over purple up anyday!
 
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