>>17729858>benchmonWell I can tell you from my experiences of raising both, taking down Porygon2 isn't easy especially if you lack fighting moves and Trace can save your skin, especially if you switch into something like Poison Heal Gliscor as it uses Toxic but it's only temporary.
Porygon-Z on the other hand is pretty underrated in my opinion, makes up for the lack of bulk with its speed and special attack, speed could be better but depending on the nature, it can work with something like Agility or Scarf. Plus it's coverage moves are good and can break bulky pokemon down trying to switch in.
Really it's whatever you need more, defense or offense.