Gdańsk suits the Baltic coast. Compare city transport first if your initial nights are in the historic centre.
The airport directory places several rental offices in the ground-floor general hall, but also lists locations elsewhere. Check your company’s entry and voucher rather than assuming all desks are together.
A car is useful for rural accommodation, lake districts and a route with stops beyond the main rail corridors. Warsaw, Kraków, Gdańsk and Wrocław city stays can be separated from the driving days to avoid paying for unused parking.
Compare airport collection with a later collection if you start with a city stay. Include the transport to a different rental branch and any extra parking nights when comparing the total cost.