Voted on the Pod.
But I really recommend the HX Stomp, PLUS some analog pedals.
In my case, I use external tuner, comp and wah. The tuner frees one footswitch, and the wah and comp frees two blocks.
Very happy with the HX Stomp.
"Too big for the Metro 16"?? How so, there are some guys using the HX Stomp on Pedaltrain nanos!
Are you planning to use just 1 overdrive on the Option #2??
Comp (Xotic SP), and Dunlop Mini Wah, just to free some blocks.
TC Polytune to free a switch
Also a Morning Star MC6 Midi Pedal, and a Dunlop Mini volume