I think that Motta should play because he is more experienced player than Sorensen who is really young so I'm not sure can he handle the preasure... Lazio will be playing defensive football and Motta with his long shots is more useful
I remember when Reja was Hajduk Split manager (this time last year) and when my club Dinamo Zagreb was playing against them ( the biggest Croatian derby), Reja's team was playing very dirty and defensive football and it really wasn't a nice game so I predict that tomorrow Lazio will play on simmilar stile. Juve will need an early goal or othervise it wil be really hard to beat them...