Use and fit should be logical selectors.
They are very different rifles IMHO.
Of the two, I would go Impact.
That will be an FAC gun for me as I variable power and switch barrel.
Impact is more modular with a huge variety of after market suppliers that are embraced by the maker.
Different barrel liners for pellet and slugs but again, thats good if its FAC.
But fit and what you need it to do would be a first criteria to look at
In a battle of wits I refuse to engage with an unarmed person.
To one shot one kill, you need to seek the S. Kill only comes from Skill