The Bolzano is very similar to the PCA, so if you are getting that, defo get Trento. Trento has some nice "odd" setups that work better than what you would expect. I have got 60+k attack in Trento in Blitz many times. Bolzano is OK, good potential, but not as good as Trento if you investigate gun options.
And yes, I have levelled them both through Blitz this last week or so.