You could also ask whether a person favors an autocracy (rule by one person; may or may not be elected), or true plural democracy (achieved virtually; ofc).
Ultimately though, Americans are railroaded into two fairly similar political directions. Even Weimar Germany had 8 major parties. The Nazi Party, before the burning of the Reichstag, had gained a 'substantial' plurality by having 38%.
I would suggest that we have a larger congress, only if we as a people changed to support more political parties.
Would decision making be slower? Yes. Less governance is good governance in my opinion, and the only things passed would be emergency measures, trully beneficial law, or (in the worst case) incredibly ugly compromise bills.