I would personally prefer a big bore revolver.
I also think policemen should be allowed to have a weapon they choose personally, not a single, standard department issued weapon for all officers...
Standard issue weapons that are chosen for tactical, not PC or political reasons make sense.
My Glock magazine will not fit into a revolver. Plus every officer is trained on that weapon and is not looking for the 35 safeties that wieners want on their weapons.