Is there one particular game you'd like to get from either BioShock: The Collection or Borderlands Legendary Collection? Turns out you don't have to buy the collections just to get the game you want. As long as you go the eShop route, you can pick and choose whatever games you want.
The Switch eShop has individual listings for all titles included in both the BioShock: The Collection and Borderlands Legendary Collection. Unfortunately, we don't have pricing on the individual games right now. Visiting the respective eShop pages for each games gives you a "redeem download code" link, but no pricing info. I'd imagine each game will end up being priced somewhere around $15 to $20, but that's just a guess based on the $50 price for the retail collections.