I ride both a Wabi Classic and a Bianchi San Jose. Each one is super fun in its own regard.
Your Pista and the Wabi classic will be alot closer to the same than my two
rides but my suggestion is to trick out the Pista and ride it with the best gear you want for the Wabi ...
then pull the trigger on the frame.
After you finish ,either sling the Pista with the stock parts or keep
both.😃