Vespa p125x - Which cylinder upgrade

Hi there, I have a 1978 p125x. I have recently put on a SIP Road 2.0 exhaust and I am looking to invest in a new cylinder. My requirements are for it to be plug and play, durable and to give more power/acceleration in and around the city. I have kind've boiled it down to either the DR177 or the Pinasco. So the question is which will give me the most power and the least trouble and secondly I believe I just need to upjet the 20/20 carb and change the plug type. Is this correct?

I only get out about once a week for a 100k ride which is mixed between highway and city.

Any help is very much appreciated.